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(1)1.2345²+0.7655²+2.469×0.7655(2)(x+1/2y)(x²+1/4y²)(x-1/2y)
题目详情
(1)1.2345²+0.7655²+2.469×0.7655
(2)(x+1/2y)(x²+1/4y²)(x-1/2y)
(2)(x+1/2y)(x²+1/4y²)(x-1/2y)
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答案和解析
1.2345²+0.7655²+2.469×0.7655=1.2345²+2×1.2345×0.7655+0.7655²=(1.2345+0.7655)²=2²=4(x+1/2y)(x²+1/4y²)(x-1/2y)=(x+1/2y)(x-1/2y)(x²+1/4y²...
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