计算(1)x×(9x^3y-3xy^2)÷(-3x^2y)(2)((x+y)^2-(x-y)^2)÷(-4xy)(3)三
1个回答
1)-3x^2+y
2)-1
3)=8.47*10^10/(100000*1.75*10^3)……自己算吧!
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