21+22+23+24+25+26+27+28+29+30用简便方法计算
9/25*17/26+13/25*9/265/3*1/12+1/3*1/47/11*6/8+5/12*6/11简便算法.→_→...
9/25*17/26+13/25*9/26 5/3*1/12+1/3*1/4 7/11*6/8+5/12*6/11 简便算法.→_→
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9/25*17/26+13/25*9/26
=17/25*9/26+13/25*9/26
=(17/25+13/25)*9/26
=30/25*9/26
=54/130
=27/65
5/3*1/12+1/3*1/4
=1/3*5/12+1/3*1/4
=(5/12+1/4)*1/3
=(5/12+3/12)*1/3
=8/12*1/3
=2/9
7/11*6/8+5/12*6/11
=6/11*7/8+5/12*6/11
=(7/8+5/12)*6/11
=(21/24+10/24)*6/11
=31/24*6/11
=31/44
=17/25*9/26+13/25*9/26
=(17/25+13/25)*9/26
=30/25*9/26
=54/130
=27/65
5/3*1/12+1/3*1/4
=1/3*5/12+1/3*1/4
=(5/12+1/4)*1/3
=(5/12+3/12)*1/3
=8/12*1/3
=2/9
7/11*6/8+5/12*6/11
=6/11*7/8+5/12*6/11
=(7/8+5/12)*6/11
=(21/24+10/24)*6/11
=31/24*6/11
=31/44
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