電子課本網(wǎng) › 第83頁

第83頁

信息發(fā)布者：

-16n

2或12

42°

19

-1

$\frac{5}{2}或\frac{11}{3}或\frac{31}{3} $

$ \begin{aligned}解：原式&=-4+\frac{3}{2}+1 \\ &=-\frac{3}{2} \\ \end{aligned}$

$ \begin{aligned}解：原式&=a?+4a?+a? \\ &=6a?. \\ \end{aligned}$

$ \begin{aligned}解：原式&=x2-9-x2+4x-4 \\ &=4x-13 \\ \end{aligned}$

$ \begin{aligned}解：原式&=[m+(2n-3)][m-(2n-3)] \\ &=m2-(2n-3)2 \\ &=m2-4n2+12n-9 \\ \end{aligned}$

$ \begin{aligned}解：原式&=a2(x-y)-16(x-y) \\ &=(x-y)(a2-16) \\ &=(x-y)(a+4)(a-4) \\ \end{aligned}$

$ \begin{aligned}解：原式&=(5a+5b)2-(3a-3b)2 \\ &=(5a+5b+3a-3b)[5a+5b-(3a-3b)] \\ &=(8a+2b)(2a+8b) \\ &=4(4a+b)(a+4b) \\ \end{aligned}$

$ \begin{aligned}解：原式&=(x+y)(x2+2xy+y2) \\ &=(x+y)(x+y)2 \\ &=(x+y)3 \\ \end{aligned}$

7

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