3/8÷[(1/5+1/4)×3/8] 2/2×4+2/24+2/48……+2/9800
3/8÷[(1/5+1/4)×3/8] 2/2×4+2/24+2/48……+2/9800
两题有理数运算题~一、(2/3-1/4-3/8+5/24)×48二、(-1)^2008-2×3^2+(-4)^2÷(-1
1×2×3+2×3×4+3×4×5……+7×8×9 简算?
1×2×3+2×3×4+3×4×5+……+7×8×9
(1*2*4+2*4*8+……+n*2n*4n)÷(1*3*9+2*6*18+……+n*3n*9n)
1÷2/1÷3/2÷4/3÷5/4÷……÷2006/2005
1*3*4+2*6*8+………+n*3n*4n / 1*4*5+2*8*10+………+n*4n*5n
1/2+3/4+5/8+……+2n+1/2^n化简
请你认真观察下列三行数:-1,2,-3,4,-5,…… 1,4,9,16,25,…… 0,3,8,15,24,……
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
1/2÷3/2÷4/3÷5/4÷……÷2012/2013
1*2+2*3+3*4+4*5+5*6+……48*49+49*50