就三道!(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a
初一数学题,要过程! (4x减3y)-[-(3y-x)+(x-y)]-5x等于? 2(a-2a-
全集U等于{(x,y)/x,y属于实数}A等于{(x,y)/x减2分之y减3等于1}B等于{(x,y)/y等于x加1}求
化简 2x-[3y-5x-(-2x-7y)]等于 ( ) A:-7x+10y B:5x+4y C:-x-4y D:9x-
已知x的绝对值等于3,y绝对值等于5,且x+y的绝对值等于-(x+y),求代数.A=(2x+y)的次方减3(x+y)的
(3x-y)²-2x(4x-5y)-(x+2y)²
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )
(x-y)的3次幂乘(x-y)的2次幂乘(y-x)等于?
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
5/12[-4/3(x-y)^3] *(x+y)^2 * (-x-y)^3 * 5/6(y-x)^2