780-x)/x*100%=25%化简 (675-y)/y*100%=10%化简
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
(x+y)(x+y+10)+25=0 x-y=3.求x,y的值
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
【(2x+y)²-y(y+4x)-8x】÷2x,其中x=100
2(x+y)-3分之2(x-y)-3(x+y)+3分之2(x-y)化简 其中x=-2,y=1
由题意:(10Y+X)-(10X+Y)=(100X+Y)-(10Y+X) Y=6X 怎么算的啊 发一些详细的
求证:(10x+y)[10x+(10-y)]=100x(x+1)+y(10-y)为恒等式,并利用此恒等式计算1998X1
化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
If two even number x,y satisfy equation x×x+100=y×y,x
化简(2x^3y^3+x^4y^2+x^2y^4)^2-x^2y^2(x+y)^2,x=2012,y=-2011
已知x^2+10xy+25y^2-1=0,化简x^3+5x^2y+x^2..
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)