7/8-6/7乘7/15 3/4乘（2/3-3/5） （1/10+1/4）乘4 97乘19/100 3/8乘（8+15）乘1/3 （4/9+5/6-1/3）乘365/4乘（2/3-3/5)1/2乘1/5+1/3乘1/5
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7/8-6/7乘7/15 3/4乘（2/3-3/5） （1/10+1/4）乘4 97乘19/100 3/8乘（8+15）乘1/3 （4/9+5/6-1/3）乘365/4乘（2/3-3/5)1/2乘1/5+1/3乘1/5
7/8-6/7乘7/15 3/4乘（2/3-3/5） （1/10+1/4）乘4 97乘19/100 3/8乘（8+15）乘1/3 （4/9+5/6-1/3）乘36
5/4乘（2/3-3/5)
1/2乘1/5+1/3乘1/5
7/8-6/7乘7/15 3/4乘（2/3-3/5） （1/10+1/4）乘4 97乘19/100 3/8乘（8+15）乘1/3 （4/9+5/6-1/3）乘365/4乘（2/3-3/5)1/2乘1/5+1/3乘1/5
7/8-6/7×7/15
=7/8-2/5
=35/40-16/40
=19/40
3/4×(2/3-3/5)
=3/4×(10/15-9/15)
=3/4×1/15
=1/20
(1/10+1/4)×4
=4×1/10+4×1/4
=2/5+1
=1又2/5
97×19/100
=(100-3)×19/100
=100×19/100-3×19/100
=19-57/100
=18又43/100
3/8×(8+15)×1/3
=(3/8×1/3)×(8+15)
=1/8×23
=23/8
(4/9+5/6-1/3)×36
=36×4/9+36×5/6-36×1/3
=16+30-12
=34
5/4×(2/3-3/5)
=5/4×(10/15-9/15)
=5/4×1/15
=1/12
1/2×1/5+1/3×1/5
=(1/2+1/3)×1/5
=(3/6+2/6)×1/5
=5/6×1/5
=1/6
这样做
7/8-6/7×7/15
=7/8-2/5
=35/40-16/40
=19/40
3/4×(2/3-3/5)
=3/4×(10/15-9/15)
=3/4×1/15
=1/20
(1/10+1/4)×4
=4×1/10+4×1/4
=2/5+1
=1又2/5
97×...
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7/8-6/7×7/15
=7/8-2/5
=35/40-16/40
=19/40
3/4×(2/3-3/5)
=3/4×(10/15-9/15)
=3/4×1/15
=1/20
(1/10+1/4)×4
=4×1/10+4×1/4
=2/5+1
=1又2/5
97×19/100
=(100-3)×19/100
=100×19/100-3×19/100
=19-57/100
=18又43/100
3/8×(8+15)×1/3
=(3/8×1/3)×(8+15)
=1/8×23
=23/8
(4/9+5/6-1/3)×36
=36×4/9+36×5/6-36×1/3
=16+30-12
=34
5/4×(2/3-3/5)
=5/4×(10/15-9/15)
=5/4×1/15
=1/12
1/2×1/5+1/3×1/5
=(1/2+1/3)×1/5
=(3/6+2/6)×1/5
=5/6×1/5
=1/6
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