问题
解答题
计算: (1)-5a5b5÷
(2)8x2-(x-2)(3x+1)-2(x+1)(x-5). |
答案
(1)-5a5b5÷
ab2,1 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.
计算: (1)-5a5b5÷
(2)8x2-(x-2)(3x+1)-2(x+1)(x-5). |
(1)-5a5b5÷
ab2,1 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.