已知1÷y-1÷x=5,求(2x+4xy-2y)÷(x-3xy-y)的值
已知1÷y-1÷x=5,求(2x+4xy-2y)÷(x-3xy-y)的值
已知|3-y|+|x+y|=0,求[2(x+y)-3(xy+4)]÷1/xy的值.
已知:x-y=1,xy=-2,求(3x-4y+2xy)-(2x-5y+5xy)的值
已知:x-y=1,xy=-2,求(3x-4y 2xy)-(2x-5y 5xy)的值
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知x/1-y/1等于3,求x-2xy-y/5x+3xy-5y的值
已知1/X-1/Y=-2,求3X-5XY-3Y/-X+3XY+Y的值