0.7分之x-0.3分之0.7-0.2x=1
x/0.7-0.7/0.3-0.2x=1
100x/7-70/3-2x=10
(100-14)x/7=(30+70)/3
114x/7=100/3
x=(100/3)×(7/114)
x=350/171确定吗抱歉。 0.7分之x-0.3分之0.7-0.2x=1x/0.7-0.7/0.3-0.2x=1100x/7-70/3-2x=10(100-14)x/7=(30+70)/386x/7=100/3x=(100/3)×(7/86)x=350/129