11分之2÷19分之11÷22分之19
=(2/11)÷(11/19)÷(19/22)
=(2/11)x(19/11)x(22/19)
=4/11

2÷(4分之3-6分之1)×9分之7
2÷(3/4-1/6)×(7/9)
2÷(9/12-2/12)×(7/9)
2÷(7/12)×(7/9)
2x(12/7)×(7/9)
2x4×(1/3)
=8/3
=2又2/3

11分之4÷19+19分之8×11分之4
=(4/11)÷19+(8/19)×(4/11)
=(4/11)x(1/19)+(8/19)×(4/11)
=(4/11)x(1/19+8/19)
=(4/11)x(9/19)
=(4/11)x(9/19)
=36/209

16分之15÷（8分之5+4分之1）
=(15/16)÷(5/8+2/8)
=(15/16)÷(7/8)
=(15/16)x(8/7)
=(15/2)x(1/7)
=15/14
=1又1/14

16分之15×17分之5+17分之2×16分之5
=(15/16)×(5/17)+(2/17)×(5/16)
=(5/16)x(15/17+2/17)
=(5/16)x(17/17)
=5/16

解方程：
2x×4分之3+5分之2=5分之4
2x(3/4)+2/5=4/5
2x(3/4)=2/5
x(3/4)=1/5
x=4/15

计算：
0.125×0.25×4×8=(0.125×8)x(0.25×4)=1x1=1
8分之7×9分之8+0.125×9分之8
=(7/8)×(8/9)+0.125×(8/9)
=7×(1/9)+1/9
=7/9+1/9
=8/9