x+y=300 5%X+53%y=25%×300
x+y=5; x^y+y^x=17
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
X-Y=500 (X-300)/Y*100%=120%
x+5x=5y 300+4x=4y-100 方程怎么解
Y={X (-5
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)