1/1*2+1/2*3+……+1/48*49+1/49*50=?
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1/1*2+1/2*3+……+1/48*49+1/49*50=?1/1*2+1/2*3+……+1/48*49+1/49*50=?1/1*2+1/2*3+……+1/48*49+1/49*50=?1/1*
1/1*2+1/2*3+……+1/48*49+1/49*50=?
1/1*2+1/2*3+……+1/48*49+1/49*50=?
1/1*2+1/2*3+……+1/48*49+1/49*50=?
1/1*2+1/2*3+……+1/48*49+1/49*50
=1-1/2+1/2-1/3+……+1/48-1/49+1/49-1/50
=1-1/50
=49/50
=1-1/2+1/2-1/3+1/3-1/4+……+1/48-1/49+1/49-1/50
=1-1/50
=49/50
(1/50-1)(1/49-1)(1/48-1)…(1/3-1)(1/2-1)
1-2/3-1/6-1/12-1/24-1/48-……1/768
1/1*2+1/2*3+……+1/48*49+1/49*50=?
1+2+3+……48+49+50+49+48+……+3+2+1用巧算,只要列个式就行了
计算(50/1)(49/1)(48/1)…(4/1)(3/1)(2/1)的值
1/1×3+1/3×5+1/5×7+…………+1/49×51和1/2×4+1/4×6+1/6×8+…………1/48×50接着 还有1/1+2 + 1/1+2+3 +……+ 1/1+2+3+……+100我明天上课用
1/1X2X3+1/2X3x4+…+1/48X49X50
(1/50-1)(1/49-1)(1/48-1)…(1/3-1)(1/2-1)=?
1+1+2+3…………...+100等于?
1+1+2+3……+100
1+1/1+2+1/123+……+1/1+2+3+……+99
(1-1+2/1)*(1-1+2+3/1)……(1-1+2+3……2011/1)
计算 1*3分之1+2*4分之1+3*5分之1+……+48*50分之1
1/2*3+1/3*4+1/4*5……+1/48*49+1/49*50是多少
巧算:50-49+48-47+…+4-3+2-1
2/1+2+2+3/1+2+3+……+2+3+……2009/1+2+……+2009
1+2+3+4……+100000好的加分…………急…………………………快……………………………………
1+1/2+1/3+ ……1/9999=?