题目内容
计算:
(1) 8x2﹣(x﹣2)(3x+1)﹣2(x+1)(x﹣5);
(2)(﹣2)3×
+
×
﹣
(1) 8x2﹣(x﹣2)(3x+1)﹣2(x+1)(x﹣5);
(2)(﹣2)3×
解:(1)原式=8x2﹣(3x2+x﹣6x﹣2)﹣2(x2﹣5x+x﹣5)
=8x2﹣3x2+5x+2﹣2x2+8x+10
=3x2+13x+12;
(2)原式=﹣8×4﹣4×
﹣3
=﹣32﹣1﹣3
=﹣36.
=8x2﹣3x2+5x+2﹣2x2+8x+10
=3x2+13x+12;
(2)原式=﹣8×4﹣4×
=﹣32﹣1﹣3
=﹣36.
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