5x=3y,x比y小15,x,y各等于几不然明天就要被打手板了

5x=3y,x比y小15,x,y各等于几不然明天就要被打手板了 x+3=5-y,那么x+y等于几 若3X=4Y,那么X;Y等于等于几比几 4x-3y= -5,4y+3x=3；x、y等于几 x+x+x=15,x+y+y=19,求y-x等于几 3x+2y=4y+3z=5z+5x,请问x:y:z等于几比几比几? X+Y=90,X/Y=5,请问X等于几?Y等于几? 0.6X=Y X比Y等于几比几 Y比X少百分之几 要算式 x、y等于几 (3x-5y)-(3x-2y)等于几 若x+5y=4,则3x+15y等于几 X加Y=320 X等于Y加Y加Y X和Y各等于几 (-x+y)(x-y)等于几 x-3=0 2x-5y=9 X,Y 等于几? (10X+10Y)÷（X-Y）=40 X,Y各等于几, x一y=120 x÷y=3 x和y分别等于几? 如果|x-2y+1|+|2x-y-5|=0 .x+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!