2个回答
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7/15÷13/4+5/13×4/15+4/15
=7/15×4/13+5/13×4/15+4/15
=4/15×7/13+5/13×4/15+4/15
=4/15×(7/13+5/13+1)
=4/15×25/13
=20/39
=7/15×4/13+5/13×4/15+4/15
=4/15×7/13+5/13×4/15+4/15
=4/15×(7/13+5/13+1)
=4/15×25/13
=20/39
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展开全部
7/15÷13/4+5/13×4/15+4/5
=28/(13×15)+20/(13×15)+4/5
=16/(13×5)+(4×13)/(13×5)
=68/(13×5)
=68/65
怎么看不懂呢?
7/15÷13/4=7/15×4/13=(4×7)/(13×15)=28/(13×15)
5/13×4/15=(5×4)/(13×15)=20/(13×15)
7/15÷13/4+5/13×4/15=(28+20)/(13×15)=48/(13×15)
=约分<分子分母同除以3>=16/(13×5)
4/5<分子分母同乘以13>=(4×13)/(13×5)=52/(13×5)
16/(13×5)+52/(13×5)=(16+52)/(13×5)=68/65
=28/(13×15)+20/(13×15)+4/5
=16/(13×5)+(4×13)/(13×5)
=68/(13×5)
=68/65
怎么看不懂呢?
7/15÷13/4=7/15×4/13=(4×7)/(13×15)=28/(13×15)
5/13×4/15=(5×4)/(13×15)=20/(13×15)
7/15÷13/4+5/13×4/15=(28+20)/(13×15)=48/(13×15)
=约分<分子分母同除以3>=16/(13×5)
4/5<分子分母同乘以13>=(4×13)/(13×5)=52/(13×5)
16/(13×5)+52/(13×5)=(16+52)/(13×5)=68/65
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