4/7xx=4/5
7x×4=4×5
x=20÷28
x=7分之5
x÷7/10=14/15
x=14/15×10/7
x=4/3
xx3/4x2/5=18
x×6/20=18
x=18÷6/20
x=60
2/3x6/7x14/25
=2/3x（6/7x14/25）
=2/3×12/25
=8/25
30÷9/10x2/5
=30×10/9×2/5
=30×（10/9×2/5）
=30×4/9
=40/3
4/9÷8x6/7。
=4/9×1/8×6/7
=1/18×6/7
=1/21
2/9x3/4÷2/9
=2/9x3/4×9/2
=3/4
3/8x5/6÷15/16
=3/8x5/6×16/15
=3/8x（5/6×16/15）
=3/8×8/9
=1/3
36x(2/9+1/4)
=36×2/9+36×1/4
=8+9
=17
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