nbl联赛2017那里转播:one problem
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1/2+1/6+1/12+1/20=?
1/(1×2)+1/(2×3)+1/(3×4)+1/(4×5)=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)把括号直接去掉,1/2、1/3、1/4、1/5又加又减可以统统去掉,剩1-1/5=4/5
1/2+1/6+1/12+1/20=60/120+20/120+10/120+6/120=96/120=4/5
1/2+1/6+1/12+1/20=60/120+20/120+10/120+6/120=96/120=4/5
one problem
one problem
one problem
one english problem
one english problem
problem!!!
Problem!!!Problem------------!!!
Everybody says that this problem is _____difficult than the one you asked me about yesterday
一道英语题: More than one possible means___to find an easy solution to the problem.
further problem