7X+8Y=4 14X+18Y=8 问X和Y等于几?
2X+8Y=17,3X+5Y=7,X和Y,等于几?
y*y*y*y+2x*x*x*x=4x*x*y 求x等于几,y等于几,写出所有选项!
xy+x-y=18,x,y各等于几
X加Y=320 X等于Y加Y加Y X和Y各等于几
6X-Y=18 = Y-4X=22,X等于几,Y等于几
x(y-1)-y(x-1)=4求x平方加y平方等于几?
x+x+x=15,x+y+y=19,求y-x等于几
x+3=5-y,那么x+y等于几
方程:已知x加y等于105,3/8x加4/7y等于49,问x和y分别是多少?
已知10y=7.5x,请问10y-7x=y+3.14,问x-y=几
x,y满足-5|x-2y|+8|y-1\2|=0则x和y等于多少
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3