1-(3/4-2/5) 9/7+1/8+3/8+5/7 9/4-(1/4+1/5)
1-(3/4-2/5)9/7+1/8+3/8+5/79/4-(1/4+1/5)还有2-2/5/3/5怎么做...
1-(3/4-2/5) 9/7+1/8+3/8+5/7 9/4-(1/4+1/5)还有2-2/5/3/5怎么做
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2017-06-21 · 知道合伙人教育行家
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1-(3/4-2/5)
=1-(15/20-8/20)
=1-7/20
=13/20
9/7+1/8+3/8+5/7
=(9/7+5/7)+(1/8+3/8)
=2+1/2
=2又1/2
9/4-(1/4+1/5)
=9/4-1/4-1/5
=2-1/5
=1又4/5
=1-(15/20-8/20)
=1-7/20
=13/20
9/7+1/8+3/8+5/7
=(9/7+5/7)+(1/8+3/8)
=2+1/2
=2又1/2
9/4-(1/4+1/5)
=9/4-1/4-1/5
=2-1/5
=1又4/5
追答
2-2/5-3/5
=2-(2/5+3/5)
=2-1
=1
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