1-2 5/12-1 1/4-3 13/15+2 1/5+1 3/15
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-
(1)12^13(3^10*4^11) (2) (5^4*3^3-5^3*3^2+5^2*3)/15
1/2×3×4×5+1/3×4×5×6+...+1/12×13×14×15+1/13×14×15×1
1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
1/1*2*3+1/2*3*4+1/3*4*5+.1/11*12*13
5/9+/7+3/4+2/9+5/9+1/5+1/12+14/15+12/13+1/8+2/3=?
能简算要简算:30×(4/5+5/6)=?2/15×3+13/15÷1/3=?
1+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+19+15+14+15+12+14+1 等于
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)
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算)