湖北省黃岡市黃梅縣2023-2024學年數(shù)學七年級第一學期期末考試模擬試題含解析

2023-2024

1.

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A.x2—(2y-x+z)=x2-2y-x+z

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C.2a+(-6x+4y—2)=2a—6x+4y—2

D.~(2x2-y)+(z+l)=-2x2-y-z-\

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A.6?fB.7?rC.8#TD.9?f

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A.2x-1=x+5[R]W2x+x=5+1

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D.-4x=2,1x=-2

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A.—+—=1B.—+=lc.12(5+x)+16x=lD.12(5+x)=16x

12161612

12.A.b,()

--------1—?1--------?

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16.(-3)3éKJJ?W__________,_￡<_?

17.fcjffl,B&C,D^IUABOW,￥&OA=2,ZCOD=120°,MW?

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B.3?-6tf-(4?+l)=3fl-6<7-4<7-l,i|h

C.2a+(-6x+4y-2)=2a-6x+4y-2,jJt?^lE^;

D.~(2x2-y)+(z+1)=-2x2+y+z+1,

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23

C>(x+2)-2(x-1)=()?￡;}§#Wxx+2-2x+2=0,JE?!?;

D,-4x=2^M^“l(fā)”^:x=-,

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=-4-1+1

=-4.

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-iX(-9xJ-2)

;X(-4-2]

=9.

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21,(1)6;(2)CD=-m.

3

77

[5X1(DJEAC+BD=9ftAAD+BC=-ABfffH-(9+CD)=2CD+9,^Hj^fg?WBPnT.

77

(2)?AC+BD=mftàAD+BC=-ABWfti-(m+CD)=2CD+m,^tH^gf?lPP?T.

7

[VèMJM:(1)AD+BC=-AB,AB=AC+CD+BD+CD,

AC+BD=9,AB=AC+BD+CD,

7

(9+CD)=2CD+9,

CD=6

(2)AC+BD=m,AB=AC+BD+CD,

A75(a+CD)=2CD+