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已知x-2y=-4,求5(x-2y)²-x+2y-60的值
人气:400 ℃ 时间:2020-04-01 21:43:45
解答
5(x-2y)²-x+2y-60
=5(x-2y)²-(x-2y)-60
=5*(-4)^2-(-4)-60
=5*16+4-60
=24
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