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(8/9+16/17)×1/8+15/17=8/9×1/8+16/17×1/8+15/17
=1/9+2/17+15/17=1/9+1
=1又1/9
10/21×7/20÷5/6+1/4
=14/3×6/5+1/4
=28/5+1/4=5+3/5+1/4
=5又17/20
(17/18-3/4+1/6)÷1/36=(17/18-3/4+1/6)×36
=17/18×36-3/4×36+1/6×36
=34-27+6
=13
2/3÷8+1/3×1/8=2/3×1/8+1/3×1/8
=(2/3+1/3)×1/8
=1/8
4/25÷[(2/5+1/3)×9/11]
=4/25÷[11/15×9/11]
=4/25÷3/5
=4/25×5/3
=4/15
=1/9+2/17+15/17=1/9+1
=1又1/9
10/21×7/20÷5/6+1/4
=14/3×6/5+1/4
=28/5+1/4=5+3/5+1/4
=5又17/20
(17/18-3/4+1/6)÷1/36=(17/18-3/4+1/6)×36
=17/18×36-3/4×36+1/6×36
=34-27+6
=13
2/3÷8+1/3×1/8=2/3×1/8+1/3×1/8
=(2/3+1/3)×1/8
=1/8
4/25÷[(2/5+1/3)×9/11]
=4/25÷[11/15×9/11]
=4/25÷3/5
=4/25×5/3
=4/15
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