问题
解答题
计算: ①(-
|
答案
①原式=
a6b4•(-8a3b6)÷(1 9
a12b12)=-1 729
a9b10×8 9
=729 a12b12
;-648 a3b2
②原式=(x+2y)[(x-2y)-(x+2y)]=(x+2y)[x-2y-x-2y]=(x+2y)[-4y]=-4xy-8y2.
计算: ①(-
|
①原式=
a6b4•(-8a3b6)÷(1 9
a12b12)=-1 729
a9b10×8 9
=729 a12b12
;-648 a3b2
②原式=(x+2y)[(x-2y)-(x+2y)]=(x+2y)[x-2y-x-2y]=(x+2y)[-4y]=-4xy-8y2.