计算(1)-12-8-1×(-1)-2×(12)-3×70(2)(3a2b+7ab2)-2(-5ab2+6a2b)(3)(2x-y)(2x+y)-(x-3y)2(4)(14a2b)•(-2ab2)2÷

题目简介

计算(1)-12-8-1×(-1)-2×(12)-3×70(2)(3a2b+7ab2)-2(-5ab2+6a2b)(3)(2x-y)(2x+y)-(x-3y)2(4)(14a2b)•(-2ab2)2÷

题目详情

计算
(1)-12-8-1×(-1)-2×(
1
2
)-3×70

(2)(3a2b+7ab2)-2(-5ab2+6a2b)
(3)(2x-y)(2x+y)-(x-3y)2
(4)(
1
4
a2b)•(-2ab2)2÷(-0.5a4b5)
题型:解答题难度:中档来源:不详

答案

(1)原式=-1-class="stub"1
8
×1×8×1,
=-2;
(2)原式=3a2b+7ab2+10ab2-12a2b
=-9a2b+17ab2;
(3)原式=4x2-y2-x2+6xy+9y2
=3x2-10y2+6xy;
(4)原式=class="stub"1
4
a2b•4a2b4÷(-class="stub"1
2
a4b5)
=a4b5÷(-class="stub"1
2
a4b5)
=-2;

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