五年級(jí)上數(shù)學(xué)簡(jiǎn)便計(jì)算規(guī)律及練習(xí)

五年級(jí)上數(shù)學(xué)簡(jiǎn)單計(jì)算規(guī)律及練習(xí)五年級(jí)上數(shù)學(xué)簡(jiǎn)單計(jì)算規(guī)律及練習(xí)/五年級(jí)上數(shù)學(xué)簡(jiǎn)單計(jì)算規(guī)律及練習(xí)五年級(jí)上數(shù)學(xué)簡(jiǎn)單計(jì)算規(guī)律及練習(xí)簡(jiǎn)單計(jì)算例題：乘法結(jié)合律：規(guī)律：在連乘算式中若是發(fā)現(xiàn)有因數(shù)25就找因數(shù)4,有因數(shù)125就找因數(shù)8,因?yàn)?5×4=100,125×8=1000。0.25×4.78×41.25×245.75×3.27÷5.75=0.25×4×478=1.25×8×3（24=8×3）=5.75÷5.75×3.27=1×4.78=10×3=1×3.27=4.78=30=3.27乘法分配律：規(guī)律1：在乘法算式中若是有因數(shù)湊近整百數(shù),就先按整百數(shù)先乘再,今后再加上或減去相應(yīng)的數(shù)乘以另一個(gè)因數(shù)的積。如：0.65×201（201=（200＋1））3.8×99（99=100－1）=0.65×（200＋1）=3.8×（100－1）=0.65×200＋0.65×1=3.8×100－3.8×1=130＋0.65=380－3.8=130.65=376.2規(guī)律2：在幾個(gè)乘法算式相加、減的題中,若是發(fā)現(xiàn)幾個(gè)乘法算式中有共同的因數(shù),可以先把這個(gè)共同因數(shù)乘以其余幾個(gè)因數(shù)相加、減的得數(shù)。如：3.64×0.43＋0.43×5.36＋0.4343×3.5－6×3.5=0.43×（3.64＋5.36＋1）（0.43=0.43×1）=3.5×（12.57＋3.43－6）=0.43×10=3.5×10=4.3=35除法性質(zhì)應(yīng)用：42.35÷2.5÷45.6÷3.5=42.35÷（2.5×4）=5.6÷（7×0.5）=42.35÷10=5.6÷7÷0.5=4.325=0.8÷0.5=1.6請(qǐng)用簡(jiǎn)單方法計(jì)算以下各題0.25×0.280.125×3.2×2.535×40.20.25×4÷0.25×43.5×9.93.5×99+3.53.5×101-3.53.5×9.9+3.5×0.13.5×2.7+35×0.733.5××0.7(32+5.6)÷0.83.5÷÷0.61/34.9÷3.57÷0.25÷47÷0.125÷87.35÷(7.35×0.25)7.35÷(7.35÷0.25)7.325-(5.325+1.7)3.29+0.73+2.277.5+2.5-7.5+2.57.325-(5.325+1.7)7.325-(5.325-1.7)3.29+0.73-2.29+2.273.29×0.25×40.125×8.863.4÷2.5÷0.44.9÷1.43.9÷（1.3×5）（7.7＋1.54）÷0.72.5×2.42.7÷450.35×1.25×2×0.832.4×0.9＋0.1×32.415÷0.2528.6×101－28.60.86×15.7－0.86×14.72.4×10214－7.32－2.682.64＋8.67＋7.36＋11.332.31×1.2×0.5（2.5－0.25）×0.49.16×1.5－0.5×9.163.6－3.6×0.52/