问题 解答题
计算:
(1)-5a5b5÷
1
3
ab2

(2)8x2-(x-2)(3x+1)-2(x+1)(x-5).
答案

(1)-5a5b5÷

1
3
ab2

=-5×3a5-1b5-2

=-15a4b3

(2)8x2-(x-2)(3x+1)-2(x+1)(x-5),

=8x2-(3x2-5x-2)-2(x2-4x-5),

=8x2-3x2+5x+2-2x2+8x+10,

=3x2+13x+12.

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