1、1/2,1/6,1/9,1/9,4/27,();2、4,13,40,121,364,();3、1,2,5,26,()
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
简便算法3/4×13/15+1/4×13/15、(1/2+1/3)×3/5、6除以9+2/3×98、(7/16×1/4)
简算 (1-1/2+1/3-1/4+1/5-1/6+...+1/49-1/50)/(1/26+1/27+...+1/50
怎么进行简便计算?1/5×27+3/5×41 ,1/17×4/9+5/17×1/9 5/6×1/13+5/9×2/13+
(1) 1,1/3,1/5,1/7,1/9 (2)- 1/2*1,1/2*2,- 1/2*3,1/2*4,-1/2*5
1/2+3/4-6/5 6/7-1/2+4/5 3/4-(7/12-5/7) 2/3+(13/15+1/3) 15/9-
6道小学方程题一.1/3x+1/4x=364二.(1-1/9)x=9/8三.3/5x=20*3/4四.2/3x-2/5x
1+2+3-4+5+6+7-8+9+10+11-12+13+14+15-16.+25+26+27-28
5/9+(3/4-1/2)
5/4*(3/10+4/15)+5/8 1/6+5/18*3/5 2-6/13*26/9-2/3
(1) 1,7,8,57,121 (2)7,9,-1,5,-3 (3)4,2,2,3,6,15
7/9*5/6/14/27 1/2*2/5+9/10/9/20 5/8*1/4/5/8*1/4 (1/2+2/3+3/4