X/(70+60)-X/(70+50)=1
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X/(70+60)-X/(70+50)=1X/(70+60)-X/(70+50)=1X/(70+60)-X/(70+50)=1X/130-X/120=112X/1560-13X/1560=1（12X-
X/(70+60)-X/(70+50)=1
X/(70+60)-X/(70+50)=1
X/(70+60)-X/(70+50)=1
X/130-X/120=1
12X/1560-13X/1560=1
（12X-13X）/1560=1
-x=1560
x=-1560
70%X+70%X-50=X怎么解
60分之x-70分之x=1求x
x-(20%*X +20%*X+50)=70怎么解?..
x+(x-12)+(x-8)=70
40%x+70%x-x=1.8
60x+70(100-x)=6300
x/60+x/80=70
X/60+X/70=52
40（x+60）=70x
x/70=x/60-5
x-50/3=x+70/5?
解方程：x-60%x=240 x+20%x=24 1-25%x=十六分之三 160%x-x=9 58%x-23%x=24 40%x+70%x-x=1.8
X/(70+60)-X/(70+50)=1
x/(60+70)+1=x/(50+70)怎么解
解方程.60x+70(50-x)=3150
70(50-X)+60x=3150求解及步骤
60x+70*(50-x)=3150 怎么解
x+(x+20)+（x-10）+70+x=540 .