作业帮2道简便运算,
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2道简便运算,
2道简便运算,
2道简便运算,
=1+3+5+7+9+11+2/12+1/12+(3/60+2/60)+1/42
=36+3/12+1/12+1/42
=36+1/3+1/42=36+15/42
=(1/1-1/4)/3+(1/4-1/7)/3+(1/7-1/10)/3+...+(1/73-1/76)/3
=(1-1/4+1/4-1/7+1/7-1/10+.+1/73-1/76)/3
=(1-1/76)/3
=75/76/3
=25/76