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28*136/137+136*20/137=180*68/137(2890+5/6+7/8+7/10)/(5/6+7/8+7/10)
题目详情
28*136/137+136*20/137=180*68/137
(2890+5/6+7/8+7/10)/(5/6+7/8+7/10)
(2890+5/6+7/8+7/10)/(5/6+7/8+7/10)
▼优质解答
答案和解析
28*136/137+136*20/137+180*68/137
=28*136/137+20*136/137+90*2*68/137
=28*136/137+20*136/137+90*136/137
=(28+20+90)*136/137
=138*136/137
=(137+1)*136/137
=137*136/137+136/137
=136又136/137
（2890+5/6+7/8+7/10）除以（5/6+7/8+7/10）
＝2890除以（5/6+7/8+7/10）+1
＝2890*120除以（5*20+7*15+7*12）+1
＝2890*120除以（289）+1
＝10*120+1
＝1201
=28*136/137+20*136/137+90*2*68/137
=28*136/137+20*136/137+90*136/137
=(28+20+90)*136/137
=138*136/137
=(137+1)*136/137
=137*136/137+136/137
=136又136/137
（2890+5/6+7/8+7/10）除以（5/6+7/8+7/10）
＝2890除以（5/6+7/8+7/10）+1
＝2890*120除以（5*20+7*15+7*12）+1
＝2890*120除以（289）+1
＝10*120+1
＝1201
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