(X+2Y)*(5A+3B)=?让我懂.
先化简,再求值:(3x-y)^2-5x(x-y),其中x=0.2,y=0.1 , (2a+b)(2a-b)-3(2a-b
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define A(x,y) x*y-x/y main(){int a=5,b=2,y;y=A(a+b,a-b);prin
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若单项式3a^x+5 b^x+y与单项式-5a^y b^2-x的差任为单项式,则x= ,y=
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