题目内容
计算:?
(1)-5a5b5÷
ab2;
(2)8x2-(x-2)(3x+1)-2(x+1)(x-5).
(1)-5a5b5÷
| 1 |
| 3 |
(2)8x2-(x-2)(3x+1)-2(x+1)(x-5).
(1)-5a5b5÷
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.
| 1 |
| 3 |
=-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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