1/3 *5 + 1/3 x =13
1/3 x = 11又1/3
x= 34
9/4 x - 4* 1/2 = 1/4
9/4 x = 2又1/4
x = 1
6- 1/2 x = 1/5
1/2 x = 5又4/5
x = 11.5
最后一题没有x,解不了...《3分之一+二分之一》X=2分之11(1/3+1/2)x = 11/25/6 x = 11/2x = 6.6