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简便计算,脱式7/15+5/12-2/1513/25-1/8-8/258/9-3/8-1/8斜竖是分数线
题目详情
简便计算,脱式
7/15 +5/12 - 2/15 13/25 -1/8 - 8/25 8/9 -3/8 - 1/8
斜竖是分数线
7/15 +5/12 - 2/15 13/25 -1/8 - 8/25 8/9 -3/8 - 1/8
斜竖是分数线
▼优质解答
答案和解析
7/15 +5/12 - 2/15
=(7-2)/15+5/12
=1/3+5/12
=(4+5)/12
=3/4
13/25 -1/8 - 8/25
= (13-8)/25 -1/8
=1/5-1/8
=(8-5)/40
=3/40
8/9 -3/8 - 1/8
= 8/9 -(3/8 +1/8 )
=8/9-1/2
=(16-9)/18
=7/18
=(7-2)/15+5/12
=1/3+5/12
=(4+5)/12
=3/4
13/25 -1/8 - 8/25
= (13-8)/25 -1/8
=1/5-1/8
=(8-5)/40
=3/40
8/9 -3/8 - 1/8
= 8/9 -(3/8 +1/8 )
=8/9-1/2
=(16-9)/18
=7/18
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