计算,能简算的要简算.我要算式和答案5/7除13/5+2/7*5/13 2-9/34除6/17-1/4 5*(1/20+2/15)-2/3〔1/2-(2/3-2/5)〕除7/10

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计算,能简算的要简算.我要算式和答案5/7除13/5+2/7*5/13 2-9/34除6/17-1/4 5*(1/20+2/15)-2/3〔1/2-(2/3-2/5)〕除7/10
计算,能简算的要简算.我要算式和答案
5/7除13/5+2/7*5/13 2-9/34除6/17-1/4 5*(1/20+2/15)-2/3
〔1/2-(2/3-2/5)〕除7/10

计算,能简算的要简算.我要算式和答案5/7除13/5+2/7*5/13 2-9/34除6/17-1/4 5*(1/20+2/15)-2/3〔1/2-(2/3-2/5)〕除7/10
5/7÷13/5+2/7*5/13
=5/7*5/13+2/7*5/13
=(5/7+2/7)*5/13
=1*5/13
=5/13
2-9/34÷6/17-1/4
=2-9/34*17/6-1/4
=2-3/4-1/4
=2-(3/4+1/4)
=2-1
=1
5*(1/20+2/15)-2/3
=5*1/20+5*2/15-2/3
=1/4+2/3-1/3
=1/4+(2/3-1/3)
=1/4+1/3
=7/12
〔1/2-(2/3-2/5)〕÷7/10
=(1/2-2/3+2/5)÷7/10
=1/2*10/7-2/3*10/7+2/5*10/7
=5/7-20/21+4/7
=5/7+4/7-20/21
=1-20/21
=1/20