Question

5/12+1/2+1/6+1/12+1/20+1/30+1/42等于多少写出算式？

Answer 1

解析如图：

Answer 2

原式=（5/12+1/12）+1/2+1/6+1/20+1/30+1/42
=1/2+1/2+1/6+1/20+1/30+1/42
=1+（10/60+3/60+2/60）+1/42
=1+1/4+1/42
=1+（21/84+2/84）
=1+23/84
=1又23/84

Answer 3

解：
5/12+1/2+1/6+1/12+1/20+1/30+1/42
=(5/12+1/12)+1/2+1/20+1/30+1/42
=1/2+1/2+1/20+1/30+1/42
=1+1/20+1/30+1/42
=1+(1/20+1/30)+1/42
=1+(3/60+2/60)+1/42
=1+1/12+1/42
=1+7/84+2/84
=1+9/84
=1+3/28
=1又3/28

Answer 4

5/12+1/2+1/6+1/12+1/20+1/30+1/42
=5/12+1/2+1/2-1/3+1/3-1/4+1/4-1/5++1/5-1/6+1/6-1/7
=5/12+1-1/7
=1又23/84