1+1+2+2+3+3+````````````````````````````+99999
3道简单的口算题(1)88888*99999=(2)8888888888*9999999999=
巧算下面2题99999*2222-3333*66666=(1-1/2)(1/3-1)(1-1/4)(1/5-1)...(
谁知道9 1/7+99 2/7+999 3/7+9999 4/7+99999 5/7+999999 6/7=
巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+
(99999+9999+999+99+9)乘1\2
将1,2,3,4,5,6,7,8,9这几个数字分别组成四个数,使其相加等于99999
1+2+3+4+5+6+7+8+9+99999+888+77+66+55+44+11+22+33+909090等于几
(1) 1,2,3( )
2 1 -2 -3
1,1/2,3/2,3/8,( ),( )
2(3+1)(3^2+1)(3^3+1)(3^4+1)(3^8+1)+1
(1/2+1/3)÷(2/3-3/2)=?