4(X-0.123)+7(Y+3.45)=1于5(x-0.123)-(y+3.45)=11同解,求X,Y
4(X-0.123)+7(Y+3.45)=1于5(x-0.123)-(y+3.45)=11同解,求X,Y
4X+7(Y+11分之10)=1于5X-(Y+11分之10)=11同解,求X,Y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
同底数幂的乘法已知:x(x-1)-(x^2-y)=1,求1/3(x-y)^3·(y-x)^2+5(x-y)[-(x-y)
已知x,y满足7X-5Y-23≤0,X+7Y-11≤0,4X=Y+10≥0,M(2,1),P(x,y),(1)求(y+7
3X+2y=5x 2(3x+2y)=11x+7,去括号后要不要把同X,y移向?
x+y=4,求(x+1/x)(y+1/y)的min
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
不解方程组x+4y=6 x-3y=1求代数式7y(x-3y)的平方-2(3y-x)的立方
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y