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1/1*4+1/4*7+1/7*10+````1/148*151速算1/1*4+1/4*7+1/7*10······+1/148*151
题目详情
1/1*4+1/4*7+1/7*10+````1/148*151速算
1/1*4+1/4*7+1/7*10······+1/148*151
1/1*4+1/4*7+1/7*10······+1/148*151
▼优质解答
答案和解析
1/1*4+1/4*7+1/7*10······+1/148*151
=(1-1/4+1/4-1/7+1/7-1/10+------+1/148-1/151)/3
=(1-1/151)/3
=(150/151)/3
=50/151
=(1-1/4+1/4-1/7+1/7-1/10+------+1/148-1/151)/3
=(1-1/151)/3
=(150/151)/3
=50/151
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