小学六年级数学提问计算1/2+1/6+1/12+1/20+1/30+1/42

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小学六年级数学提问计算1/2+1/6+1/12+1/20+1/30+1/42小学六年级数学提问计算1/2+1/6+1/12+1/20+1/30+1/42小学六年级数学提问计算1/2+1/6+1/12+

小学六年级数学提问计算1/2+1/6+1/12+1/20+1/30+1/42
小学六年级数学提问
计算1/2+1/6+1/12+1/20+1/30+1/42

小学六年级数学提问计算1/2+1/6+1/12+1/20+1/30+1/42
1/2+1/6+1/12+(1/20+1/30)+1/42
=1/2+1/6+(1/12+1/12)+1/42
=1/2+(1/6+1/6)+1/42
=1/2+1/3+1/42
=5/6+1/42
=35/42+1/42
=36/42
=6/7

开始菜单-所有程序-附件-计算机

得七分之六

1/2+1/6+1/12+1/20+1/30+1/42
=210/420+70/420+35/420+21/420+14/420+10/420
=360/420=6/7

结果是6/7