小數(shù)方程計算專項練習試題

...wd......wd......wd...小數(shù)方程專項練習〔有答案〕〔1〕〔x+0.55〕×4=3.6〔2〕2x÷8=0.8〔3〕1.5×2+2x=5〔4〕4.7x=1.9x+7〔5〕12.6〔x+4.8〕÷2=63〔6〕12.5+4x=21.7〔7〕13.5x﹣8.5x=20〔8〕6x﹣8.5×4=20〔9〕36÷x=0.4〔10〕9.6x﹣x=43〔11〕3x﹣4×0.9=46.2〔12〕3.5x﹣4×7=42〔13〕x﹣0.9x=81.9〔14〕3.8+5x=12.3〔15〕4〔0.3+x〕=6.8〔16〕8x﹣1.6x=19.2〔17〕x÷1.8=1.62〔18〕22.5×2+5x=135，〔19〕1.4x+9.8=22.4，〔20〕2〔x﹣3〕=11.6，〔21〕68﹣4.4x=24，〔22〕1.6×8﹣5x=2.3〔23〕2.5x÷20=16〔24〕6.2x﹣x=41.6〔25〕x÷0.5=48.6×2〔26〕5X﹣7.8=20.2，〔27〕2.5X﹣X=1.8，〔28〕〔4.5+X〕×2=13，〔29〕7x﹣2×9=80，〔30〕13x﹣7.5x=18.7，〔31〕〔x+12〕×6=108，〔32〕4x+3×0.7=6.5〔33〕2×〔x﹣0.5〕=1.6〔34〕3x×2.34=4.914〔35〕1.44÷x=0.4〔36〕2x+6=12.5〔37〕2.5x﹣x=1.2〔38〕〔4.5+x〕×2=63〔39〕2x﹣2.5×10=15〔40〕3.85+1.5x=6.1〔41〕13〔x+2.5〕=169〔42〕2x﹣2+1.8=3.6〔43〕7〔x﹣1.2〕=3.57〔44〕2+1.8﹣2x=3.6〔45〕7x÷0.3=4.2〔46〕6x+4x﹣11=32.9〔47〕7〔x﹣1.2〕=2.87〔48〕2.4+3.4x=5.8〔49〕5〔x﹣1.2〕=35〔50〕2.5x+51=17×8〔51〕2.4x+1.6x=2.2〔52〕8〔x﹣6.2〕=41.6〔53〕0.5〔x﹣0.5〕=7.5〔54〕〔9x+1.5+7x〕÷5=5.1〔55〕3x+7=29.5〔56〕5x﹣2.8×1.2=1.04〔57〕4x+6x=28.5〔58〕2.38x+9.8=33.6〔59〕2〔x﹣3〕=10.6〔60〕13x﹣x=14.4〔61〕68﹣1.1x=24〔62〕3〔x+3.5〕=21.6〔63〕3x﹣54=136.5〔64〕x﹣0.36x=3.2〔65〕4x+2.8×4=19.32〔66〕4x﹣5.2=5.2〔67〕4.8x+2.6x=3.7〔68〕3x+6.4×2=50.3〔69〕2.7x﹣1.8=1.2x+2.7，〔70〕8﹣5〔6x+0.7〕=10x+0.5，〔71〕7÷x﹣0.7=1.3，〔72〕〔5.9+x〕÷3+16=30，〔73〕0.56×5﹣4x=0.4，〔74〕4〔x﹣0.5〕=9.6，〔75〕2×〔x+1.7〕=9.2〔76〕8x﹣4x=0.64〔77〕2x﹣0.24=0.12〔3.8﹣2〕x=14.4〔79〕64﹣16X=56.8〔80〕8.6X﹣2.6X=36.6〔82〕6×4﹣0.6X=6.36〔83〕0.03×150﹣5x=3.2〔84〕45.3﹣4X=35.7，〔85〕3〔5.4+X〕÷6=7.2，〔86〕5.9X+7=8.7X，〔87〕3+0.6x=4.32〔88〕0.6〔y﹣0.4〕=6，小數(shù)方程88題參考答案：〔1〕〔x+0.55〕×4=3.6〔x+0.5〕×4÷4=3.6÷4x+0.5=0.9x+0.5﹣0.5=0.9﹣0.5x=0.4〔2〕2x÷8=0.82x÷8×4=0.8×4x=3.2〔3〕1.5×2+2x=53+2x=53+2x﹣3=5﹣32x÷2=2÷2x=1〔4〕4.7x=1.9x+74.7x﹣1.9x=1.9x﹣1.9x+72.8x=72.8x÷2.8=7÷2.8x=2.5〔5〕12.6〔x+4.8〕÷2=636.3×〔x+4.8〕=636.3×〔x+4.8〕÷6.3=63÷6.3x+4.8=10x+4.8﹣4.8=10﹣4.8x=5.2；〔6〕12.5+4x=21.712.5+4x﹣12.5=21.7﹣12.54x÷4=9.2÷4x=2.3〔7〕13.5x﹣8.5x=205x÷5=20÷5x=4〔8〕6x﹣8.5×4=206x﹣34=206x﹣34+34=20+346x÷6=54÷6x=9〔9〕36÷x=0.436÷x×x=0.4×x36=0.4×x36÷0.4=0.4×x÷0.4x=90；〔10〕9.6x﹣x=43〔9.6﹣1〕x=438.6x÷8.6=43÷8.5x=5；〔11〕3x﹣4×0.9=46.23x﹣3.6=46.23x﹣3.6+3.6=46.2+3.63x÷3=49.8÷3x=16.6〔12〕3.5x﹣4×7=423.5x﹣28=423.5x﹣28+28=42+283.5x=703.5x÷3.5=70÷3.5x=20；〔13〕x﹣0.9x=81.90.1x=81.90.1x÷0.1=81.9÷0.1x=819；〔14〕3.8+5x=12.33.8+5x﹣3.8=12.3﹣3.85x=8.55x÷5=8.5÷5x=1.7；〔15〕4〔0.3+x〕=6.84〔0.3+x〕÷4=6.8÷40.3+x=1.70.3+x﹣0.3=1.7﹣0.3x=1.4〔16〕8x﹣1.6x=19.26.4x=19.2，6.4x÷6.4=19.2÷6.4，x=3；〔17〕x÷1.8=1.62x÷1.8×1.8=1.62×1.8，x=2.916；〔18〕22.5×2+5x=135，45+5x﹣45=135﹣45，5x÷5=90÷5，x=18．〔19〕1.4x+9.8=22.4，1.4x+9.8﹣9.8=22.4﹣9.8，1.4x=12.6，1.4x÷1.4=12.6÷1.4，x=9；〔20〕2〔x﹣3〕=11.6，2x﹣6=11.6，2x﹣6+6=11.6+6，2x=17.6，2x÷2=17.6÷2，x=8.8；〔21〕68﹣4.4x=24，68﹣4.4x+4.4x=24+4.4x，24+4.4x=68，24+4.4x﹣24=68﹣24，4.4x=44，4.4x÷4.4=44÷4.4，x=10〔22〕1.6×8﹣5x=2.312.8﹣5x+5x=2.3+5x2.3+5x﹣2.3=12.8﹣2.35x÷5=10.5÷5x=2.1；〔23〕2.5x÷20=162.5x÷20×20=16×202.5x÷2.5=320÷2.5x=128；〔24〕6.2x﹣x=41.65.2x=41.65.2x÷5.2=41.6÷5.2x=8；〔25〕x÷0.5=48.6×2x÷0.5=97.2x÷0.5×0.5=97.2×0.5x=48.6〔26〕5X﹣7.8=20.2，5x﹣7.8+7.8=20.2+7.8，5x÷5=28÷5，x=5.6；〔27〕2.5X﹣X=1.8，1.5x÷1.5=1.8÷1.5，x=1.2；〔28〕〔4.5+X〕×2=13，〔4.5+x〕×2÷2=13÷2，4.5+x﹣4.5=6.5﹣4.5，x=2．〔29〕7x﹣2×9=80，7x﹣18=80，7x﹣18+18=80+18，7x=98，7x÷7=98÷7，x=14；〔30〕13x﹣7.5x=18.7，〔13﹣7.5〕x=18.7，5.5x=18.7，5.5x÷5.5=18.7÷5.5，x=3.4；〔31〕〔x+12〕×6=108，〔x+12〕×6÷6=108÷6，x+12=18，x+12﹣12=18﹣12，x=6．〔32〕4x+3×0.7=6.54x+2.1=6.54x+2.1﹣2.1=6.5﹣2.14x=4.44x÷4=4.4÷4x=1.1〔33〕2×〔x﹣0.5〕=1.62x﹣1=1.62x﹣1+1=1.6+12x=2.62x÷2=2.6÷2x=1.3〔34〕3x×2.34=4.9147.02x=4.9147.02x÷7.02=4.914÷7.02x=0.7〔35〕1.44÷x=0.41.44÷x×x=0.4×x0.4x=1.440.4x÷0.4=1.44÷0.4x=3.6〔36〕2x+6=12.52x+6﹣6=12.5﹣62x÷2=6.5÷2x=3.25；〔37〕2.5x﹣x=1.21.5x=1.21.5x÷1.5=1.2÷1.5x=0.8；〔38〕〔4.5+x〕×2=63〔4.5+x〕×2÷2=63÷24.5+x﹣4.5=31.5﹣4.5x=27；〔39〕2x﹣2.5×10=152x﹣25+25=15+252x÷2=40÷2x=20．〔40〕3.85+1.5x=6.13.85+1.5x=6.13.85﹣3.85+1.5x=6.1﹣3.851.5x=2.251.5x÷1.5=2.25÷1.5x=1.5〔41〕13〔x+2.5〕=16913〔x+2.5〕÷13=169÷13x+2.5=13x+2.5﹣2.5=13﹣2.5x=11.5〔42〕2x﹣2+1.8=3.62x﹣0.2=3.62x+0.2﹣0.2=3.6+0.22x=3.82x÷2=3.8÷2x=1.9〔43〕7〔x﹣1.2〕=3.577〔x﹣1.2〕÷7=3.57÷7x﹣1.2=0.51x+1.2﹣1.2=1.2+0.51x=1.71〔44〕2+1.8﹣2x=3.63.8﹣2x+2x=3.6+2x3.8﹣3.6=3.6+2x﹣3.60.2÷2=2x÷2x=0.1；〔45〕7x÷0.3=4.27x÷0.3×0.3=4.2×0.37x÷7=1.26÷7x=0.18；〔46〕6x+4x﹣11=32.910x﹣11+11=32.9+1110x÷10=43.9÷10x=4.39；〔47〕7〔x﹣1.2〕=2.877〔x﹣1.2〕÷7=2.87÷7x﹣1.2+1.2=0.41+1.2x=1.61〔48〕2.4+3.4x=5.82.4+3.4x﹣2.4=5.8﹣2.43.4x=3.43.4x÷3.4=3.4÷3.4x=1；〔49〕5〔x﹣1.2〕=355〔x﹣1.2〕÷5=35÷5x﹣1.2=7x﹣1.2+1.2=7+1.2x=8.2；〔50〕2.5x+51=17×82.5x+51=1362.5x+51﹣51=136﹣512.5x=852.5x÷2.5=85÷2.5x=34．〔51〕2.4x+1.6x=2.24x=2.24x÷4=2.2÷4x=0.55；〔52〕8〔x﹣6.2〕=41.68〔x﹣6.2〕÷8=41.6÷8x﹣6.2+6.2=5.2+6.2x=11.4．〔53〕0.5〔x﹣0.5〕=7.50.5〔x﹣0.5〕÷0.5=7.5÷0.5x﹣0.5=15x﹣0.5+0.5=15+0.5x=15.5；〔54〕〔9x+1.5+7x〕÷5=5.1〔16x+1.5〕÷5=5.1〔16x+1.5〕÷5×5=5.1×516x+1.5=25.516x+1.5﹣1.5=25.5﹣1.516x=2416x÷16=24÷16x=1.5；〔55〕3x+7=29.53x+7﹣7=29.5﹣73x=22.53x÷3=22.5÷3x=7.5〔56〕5x﹣2.8×1.2=1.045x﹣3.36=1.045x﹣3.36+3.36=1.04+3.365x=4.45x÷5=4.4÷5x=0.88〔57〕4x+6x=28.510x=28.810x÷10=28.5÷10x=2.85〔58〕2.38x+9.8=33.62.38x+9.8﹣9.8=33.6﹣9.82.38x÷2.38=23.8÷2.38x=10〔59〕2〔x﹣3〕=10.62〔x﹣3〕÷2=10.6÷2x﹣3+3=5.3+3x=8.3；〔60〕13x﹣x=14.412x=14.412x÷12=14.4÷12x=1.2；〔61〕68﹣1.1x=2468﹣1.1x+1.1x=24+1.1x68﹣24=24+1.1x﹣2444÷1.1=1.1x÷1.1x=40．〔62〕3〔x+3.5〕=21.63〔x+3.5〕÷3=21.6÷3x+3.5﹣3.5=7.2﹣3.5x=3.7；〔63〕3x﹣54=136.53x﹣54+54=136.5+543x÷3=190.5÷3x=63.5；〔64〕x﹣0.36x=3.20.64x=3.20.64x÷0.64=3.2÷0.64x=5；〔65〕4x+2.8×4=19.324x+11.2﹣11.2=19.32﹣11.24x÷4=8.12÷4x=2.03．〔66〕4x﹣5.2=5.24x﹣5.2+5.2=5.2+5.24x=10.44x÷4=10.4÷4x=2.6；〔67〕4.8x+2.6x=3.77.4x=3.77.4x÷7.4=3.7÷7.4x=0.5；〔68〕3x+6.4×2=50.33x+12.8=50.33x+12.8﹣12.8=50.3﹣12.83x=37.53x÷3=37.5÷3x=12.5．〔69〕2.7x﹣1.8=1.2x+2.7，2.7x﹣1.8+1.8=1.2x+2.7+1.8，2.7x﹣1.2x=1.2x+4.5﹣1.2x，1.5x÷1.5=4.5÷1.5，x=3；〔70〕8﹣5〔6x+0.7〕=10x+0.5，8﹣30x﹣3.5=10x+0.5，4.5﹣30x+30x=10x+0.5+30x，4.5﹣0.5=40x﹣0.5，4÷40=40x÷40，x=0.1；〔71〕7÷x﹣0.7=1.3，7÷x﹣0.7+0.7=1.3+0.7，7÷x×x=2×x，7÷2=2x÷2，x=3.5；〔72〕〔5.9+x〕÷3+16=30，〔5.9+x〕÷3+16﹣16=30﹣16，〔5.9+x〕÷3×3=14×3，5.9+x﹣5.9=42﹣5.9，x=36.1．〔73〕0.56×5﹣4x=0.4，2.8﹣4x=0.4，2.8﹣4x+4x=0.4+4x，0.4+4x=2.8，0.4+4x﹣0.4=2.8﹣0.4，4x=2.4，4x÷4=2.4÷4，x=0.6；〔74〕4〔x﹣0.5〕=9.6，4x﹣2=9.6，4x﹣2+2=9.6+2，4x=11.6，4x÷4=11.6÷4，x=2.9．〔75〕2×〔x+1.7〕=9.22×〔x+1.7〕÷2=9.2÷2x+1.7=4.6x+1.7﹣1.7=4.6﹣1.7x=2.9．〔76〕8x﹣4x=0.644x=0.644x÷4=0.64÷4x=0.16．〔77〕2x﹣0.24=0.122x﹣0.24+0.24=0.12+0.242x=0.362x÷2=0.36÷2x=0.18．〔78〕〔3.8﹣2〕x=14.41.8x=14.41.8x÷1.8=14.4÷1.8x=8．〔79〕64﹣16X=56.864﹣16X+16X=56.8+16X16X+56.8=6416X+56.8﹣56.8=64﹣56.816X=7.216X÷16=7.2÷16X=0.45；〔80〕8.6X﹣2.6X=36.66X=36.66X÷6=36.6÷6X=6.1；〔8