当2y-x=5时,5(x-2y)²-3(-x+2y)-100的值是
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当2y-x=5时,5(x-2y)²-3(-x+2y)-100的值是
当2y-x=5时,5(x-2y)²-3(-x+2y)-100的值是
当2y-x=5时,5(x-2y)²-3(-x+2y)-100的值是
直接代入就可以计算
5(x-2y)²=5(2y-x)²=5*25=125
3(-x+2y)=15
125-15-100=10