3/4÷7/8÷7/15
=3/4×8/7×15/7
=6/7×15/7
=90/49
5/12÷7/12×7/9
=5/12×12/7×7/9
=5/7×7/9
=5/9
24÷16/3×3/8
=24×3/16×3/8
=9/2×3/8
=27/16
2/3×18÷7/4
=12×4/7
=48/7
4/7x=28
解：x=28÷4/7
x=28×7/4
x=49
x÷2/9=6/7
解：x=6/7×2/9
x=4/21
49分之90
9分之5
16分之27
7分之48
x=28x7/4=49
x=6/7x2/9=7/27
3/4÷7/8÷7/15
=3/4×8/7×15/7
=6/7×15/7
=90/49
5/12÷7/12×7/9
=5/12×12/7×7/9
=5/9
24÷16/3×3/8
=24×3/16×3/8
=27/16
2/3×18÷7/4
=2/3×18×4/7
=12×4/7
=48/7
4/7x＝28
X=28×7/4
X=49
x÷2/9＝6/7
X=6/7×9/2
X=27/7
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