先化简,再求值 5x的平方-(3y的平方+7xy)+(2y的平方-5x的平方),其中,x=0.1,y=-0.2
人气:428 ℃ 时间:2019-10-28 17:29:02
解答
5x ²-(3y ²+7xy)+(2y ²-5x ²)
=5x ²-3y ²-7xy+2y ²-5x ²
=-y ²-7xy
=-0.04-7*0.1*(-0.2)
=0.1
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