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> 计算:(1);(2);(3)已知2x-y的平方根为±4,-2是y的立方根,求-2xy的平方根。-八年级数学
计算:(1);(2);(3)已知2x-y的平方根为±4,-2是y的立方根,求-2xy的平方根。-八年级数学
题目简介
计算:(1);(2);(3)已知2x-y的平方根为±4,-2是y的立方根,求-2xy的平方根。-八年级数学
题目详情
计算:
(1)
;
(2)
;
(3)已知2x-y的平方根为±4,-2是y的立方根,求-2xy的平方根。
题型:计算题
难度:中档
来源:江苏期中题
答案
解:(1)原式=3-4-3
=-4;
(2)原式=2+
-1-
=1;
(3)由题意得
∴x=4
∴-2xy=-2×4×(-8)=64
∴-2xy的平方根是±8。
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题目简介
计算:(1);(2);(3)已知2x-y的平方根为±4,-2是y的立方根,求-2xy的平方根。-八年级数学
题目详情
(1)
(2)
(3)已知2x-y的平方根为±4,-2是y的立方根,求-2xy的平方根。
答案
=-4;
(2)原式=2+
=1;
(3)由题意得
∴x=4
∴-2xy=-2×4×(-8)=64
∴-2xy的平方根是±8。