[2-(4/1-8/3)]×11/6
[2-(4/1-8/3)]×11/6
11 11 2 11 3 3 11 4 6 4 11 ( ) ( ) ( ) ( )1
5/6+2/9+7/18 11/12-(3/8-1/12) 2/3-1/4-1/6 7/11-1/5+8/11-4/5
简算:(8/11*6/7*1又1/3) 除以(4/11*3/7*2/3)
已知:1*6=1×2×3×4×5×6,6*6=6×7×8×9×10×11,计算(2*5)÷(6*6)?
(2-3)-(5*7-8)+11-(9-6-4)*(3+1)= (1/2-3)*(1-1/2-1/
找规律 1,4,5,4,6,4,11( ),( ).2,3,4,5,8,7,( ),( ).0,2,2,4,6,10,(
(3/11-6/7+3/4)+8/11+6/7-1/2)简便方法
1/1+(1/1+2)+(1/1+2+3)……+(1/1+2+3+4+5+6+7+8+9+10+11)=
(2*5+2)(4*7+2)(6*9+2)(8*11+2)...(20*23+2)/ (1*4+2)(3*6+2)(5*
算24点:(1)1 5 9 12 (2)1 6 10 13 (3)2 4 8 11(4)3 5 12 12
计算:(1+2-3)(-4+5+6-7)(-8+9+10-11)-12+...+2009.