7/10-3/5+7/10-3/5 8/9-(2/9+1/3)简便计算? 10
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7/10-3/5+7/10-3/5
= 2(7/10-3/5)
= 2(7/10 - 6/10)
= 1/5
8/9-(2/9+1/3)
= (8-2-3)/9
= 1/3
= 2(7/10-3/5)
= 2(7/10 - 6/10)
= 1/5
8/9-(2/9+1/3)
= (8-2-3)/9
= 1/3
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展开全部
7/10-3/5+7/10-3/5
=7/10+7/10-(3/5+3/5)
=7/5-6/5
=1/5
8/9-(2/9+1/3)
=8/9-2/9-1/3
=8/9-2/9-3/9
=3/9
=1/3
=7/10+7/10-(3/5+3/5)
=7/5-6/5
=1/5
8/9-(2/9+1/3)
=8/9-2/9-1/3
=8/9-2/9-3/9
=3/9
=1/3
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