数学题3x+2y=10 2x-4y=-2
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
数学题3x+2y=10 2x-4y=-2
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
数学题(2x+y):(x+2y)=2:3,x:y得多少
我问一道数学题 3(x-y)-2(x+y)+2其中x=-1 y=3/4
数学题{3X-2Y=10 5X+3Y=80
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
数学题化简再求值(1/x-y+1/x+y)÷x^2 y^2/x^2-y^2,其中x=3,y=-√2
数学题--已知x+1/2=y+3/4=x+y/5,则3x+2y+1/x+2y+3=
数学题--已知x+1/2=y+3/4=x+y/5,则3x+2y+1/2x-y+3=?
一道初一下学期数学题二元一次方程组{[2x+y]/4-[5(x-2y)]/3=6 {[3(2x+y)]/4-[x-2y]
一道数学题:若x平方+y平方+2x-4y+5=0,先化简[(x/x-y)-1]/[y平方/x+y]