当2y-x=5时,5(x-2y)^2-3(-x+2y)-100的值是?
4个回答
5(x - 2y)² -3(-x + 2y) - 100
= 5(2y - x)² -3(2y - x) - 100
= 5×5² - 3×5 - 100
= 125 - 15 - 100
= 10
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