十五分之十一加九分之二加十三分之二加九分之四简便用算
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解:11/15+(2/9)+(2/13)+(4/9)
=11/15+(2/13)+(2/9)+(4/9)
=11/15+(2/13)+(6/9)
=11/15+(2/3)+(2/13)
=11/15+(10/15)+(2/13)
=21/15+(2/13)
=7/5+(2/13)
=91/65+(10/65)
=101/65
=11/15+(2/13)+(2/9)+(4/9)
=11/15+(2/13)+(6/9)
=11/15+(2/3)+(2/13)
=11/15+(10/15)+(2/13)
=21/15+(2/13)
=7/5+(2/13)
=91/65+(10/65)
=101/65
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11/15+2/9+2/13+4/9
=11/15+(2/9+4/9)+2/13
=11/15+2/3+2/13
=11/15+10/15+2/13
=21/15+2/13
=7/5+2/13
=91/65+14/65
=105/65
=21/13
=11/15+(2/9+4/9)+2/13
=11/15+2/3+2/13
=11/15+10/15+2/13
=21/15+2/13
=7/5+2/13
=91/65+14/65
=105/65
=21/13
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