11/15÷7/3+4/15×3/7
=11/15×3/7+4/15×3/7
=﹙11/15+4/15﹚×3/7
=1×3/7
=3/7,等于7分之3
18×2/3-1/4×8/9不用简便算法算
=12-2/9
=11又7/9,等于11又9分之7
[﹙1.2-2/3﹚×15/8]×﹙1÷0.5﹚
=[1.2×15/8-2/3×15/8]×2
=[9/4-5/4]×2
=1×2
=2
1/2×5/33+1/3×5/33+1/6×5/33
=﹙1/2+1/3+1/6﹚×5/33
=1×5/33
=5/33,等于33分之5