1.5x+1.1y=50

x+y=50 1.5x+1.1y=50 x+y=150 1.5x+1.1y=50 1.5x+1.1y=50 (x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5 y+19=x x=1.5y 求x? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 [3x^2-(x+y)(y-x)][2(-x-y)(y-x)+2x^2+3y^2],其中x=-2分之1,y=1.5 [(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5 已知：x(x-50y)+xy=50y^2,求：(x-y):y=? 化简 x / y(x+y) - y / x(x+y) = 化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5 先化简,后求值:[(x-y)²+(x+y)(x-y)]÷2x,其中x=3,y=1.5 已知x+y=-4试计算多项式0.5(x+y)+4(x-y)-3(x-y)-1.5(x+y)-x+y的值 求 X Y公式X+Y=50Y/X=3X+Y=100Y/X=3求 x y...公式 x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 求解方程50x+40y=50×1.1x+40×0.85y x+y=15 1.15x+1.1y=17 1.5X+Y=12.8 x=?y=?