脱式计算！能简算的要简算！【急！
8\15+2\5+7\94\5+7\11+1\5+4\115\3-1\8-7\84\5+(7\10-13\20)...
8\15+2\5+7\9
4\5+7\11+1\5+4\11
5\3-1\8-7\8
4\5+(7\10-13\20) 展开
4\5+7\11+1\5+4\11
5\3-1\8-7\8
4\5+(7\10-13\20) 展开
1个回答
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8\15+2\5+7\9
=8/15+6/15+7/9
=14/15+7/9
=42/45+35/45
=77/45
4\5+7\11+1\5+4\11
=(4/5+1/5)+(7/11+4/11)
=1+1
=2
5\3-1\8-7\8
=5/3-(7/8+1/8)
=5/3-1
=2/3
4\5+(7\10-13\20)
=4/5+14/20-13/20
=16/20+1/20
=17/20
=8/15+6/15+7/9
=14/15+7/9
=42/45+35/45
=77/45
4\5+7\11+1\5+4\11
=(4/5+1/5)+(7/11+4/11)
=1+1
=2
5\3-1\8-7\8
=5/3-(7/8+1/8)
=5/3-1
=2/3
4\5+(7\10-13\20)
=4/5+14/20-13/20
=16/20+1/20
=17/20
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