100+(X-100)/10=200+[X-200-100-(X-100)/10]/10
x+y=200 (100×1×x):(100×1.5×y)=3:4
5x+27=30+0.5x 100-4(8-3x)=200 3.5x-1.2=2.7x+3 7(x
200+10x=150+20x
2(200-x)-4x=100 怎么解
30/100x+70/100【200-x】=200×54/100 解X
(X+X)+(X-X)+(X*X)+(X/X)=100
6x-2x+3x-3x-x=1.2×3
像5-x>3,2x+5,16-7=9,3x+4=12,50x=200-100,0+x=2.9,2.5x=+0,4x<18
1+X+X×X=91
7:x=14:(2+x)求x
X²+3X-130=0求解X?