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# 整 式 的 加 减复习 - PowerPoint PPT Presentation

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1.求整式x2-7x-2与-2x2+4x-1的差。

(x2-7x-2)-(-2x2+4x-1)

= x2 -7x –2 + 2x2-4x +1

= 3x2 -11x-1

(1)求2x2y3,-4x2y3,-3x2y3的和

(2) (8xy-3y2)-5xy-2(3xy-2x2)

2.计算：-2y3+(3xy2-x2y)-2(xy2-y3).

3 化简求值:2x2y-3xy2+4x2y-5xy2,其中x=1,y=-1

2x2y-3xy2+4x2y-5xy2

=(2x2y+4x2y)+(-3xy2-5xy2)

=6x2y-8xy2

=-14

### 练一练：将代数式先化简，再求值：

4，完成下面各题

（1）已知x －y = 2,则6 －x + y值为———

（2）已知m2 + m +2的值为5时,则代数式

2m2 + 2m － 6的值为______

### 练一练：

6 － 4m2 + 2m 的值为______

(n+1)只

n只

(n+2)只

(n+3)只

a-(b+2)-(b+3)

=a-b-2-b-3

=a-2b-5

B动物们要举行庆祝大会，兔妈妈受到邀请，准备了一个合唱的节目，兔妈妈想这样安排，第一排站

C

D

x

D

C

x2

×（-3）

1.(8分)一矩形纸片的边长为a和b,剪去一部分后,剩余部分如图所示,则剩余部分的周长是( )

A.a+b B.2a+2b C.a+2b D.2a+b

2.(5分)计算(7m2 - 2m2 )的结果为( )

A.9m2 B. -9m2 C. 5m2 D.-5m2

3.(6分)当x=-3时,代数式3x-2x2+5+3x2-2x –5的值为( )

A.7 B. -6 C. -9 D. 6

4.(5分)3x与3x-3的差是( )

A.6x-3 B.-3 C.6x+3 D.3

5.(6分)右图是数值转换机,若输入的x的值

A. 18 B. -18 C.-27 D.27

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