4X+5Y=23 X+Y=5 由X+Y=5得X=5-Y 将X=5-Y代入4X+5Y=23中得:4(5-Y)+5Y=23 20-4Y+5Y=23 Y=3 X=5-Y=5-3=220-4Y+5Y=23 为什么等于 Y=3 4(5-Y)+5Y=23 为什么等于20-4Y+5Y=23
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5x-4y(y-x)=?
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
x+y/y=5/4,则x/y=----------------
已知:4x = 5y,求(x+y) :y
x*x+2x+y*y-4y+5=0 x= y=
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
x+y=5; x^y+y^x=17
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y=
y=|-x.x+4x+5|
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
(X-Y)(X+Y)=5 能解么