Simple calculation of [3 and 1 / 4 - (0.2 + 1 / 3) × 3.5] (6.05 + 1 / 20) The answer must be right, crab 2 36 × 234.5 + 256 / 25 △ 2 / 11110 + 6543 × 3 and 5 / 3 (2 / 11 × 13) + (2 / 13 × 15) + (2 / 15 × 17) + (2 / 17 × 19) + (2 / 19 × 21) + (1 / 21)= 3 (7 / 13) × (5 / 8) + (2 / 13) × (7 / 16) - (1 / 13) × (3 and 1 / 2)= 4 （1＋1/1×3）×（1＋1/2×4）×…… ×（1＋1/8×10）= 5（1＋2/2）×（1＋2＋3/2＋3）×（1＋2＋3＋4/2＋3＋4）×…… ×（1＋2＋…… ＋2001/2＋3＋…… ＋2001）= 6 36 × 234.5 + 256 / 25 △ 2 / 11110 + 6543 × 3 and 5 / 3=

Simple calculation of [3 and 1 / 4 - (0.2 + 1 / 3) × 3.5] (6.05 + 1 / 20) The answer must be right, crab 2 36 × 234.5 + 256 / 25 △ 2 / 11110 + 6543 × 3 and 5 / 3 (2 / 11 × 13) + (2 / 13 × 15) + (2 / 15 × 17) + (2 / 17 × 19) + (2 / 19 × 21) + (1 / 21)= 3 (7 / 13) × (5 / 8) + (2 / 13) × (7 / 16) - (1 / 13) × (3 and 1 / 2)= 4 （1＋1/1×3）×（1＋1/2×4）×…… ×（1＋1/8×10）= 5（1＋2/2）×（1＋2＋3/2＋3）×（1＋2＋3＋4/2＋3＋4）×…… ×（1＋2＋…… ＋2001/2＋3＋…… ＋2001）= 6 36 × 234.5 + 256 / 25 △ 2 / 11110 + 6543 × 3 and 5 / 3=

（2/11×13）＋（2/13×15）＋（2/15×17）＋（2/17×19）＋（2/19×21）＋（1/21）
=1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19+1/19-1/21+1/21
=1/11；
(7 / 13) × (5 / 8) + (2 / 13) × (7 / 16) - (1 / 13) × (3 and 1 / 2)
=7/13*5/8+7/13*2/16-1/13*7/2
=7/13*(5/8+2/16-1/2)
=7/13*1/4
=7/52；
（1＋1/1×3）×（1＋1/2×4）×…… ×（1＋1/8×10）
=2*2*3*3*4*4*5*5*6*6*7*7*8*8*9*9/1*2*3*4*5*6*7*8*3*4*5*6*7*8*9*10
=9/5；
（1＋2/2）×（1＋2＋3/2＋3）×（1＋2＋3＋4/2＋3＋4）×…… ×（1＋2＋…… ＋2001/2＋3＋…… ＋2001）
=6/4*12/10*20/18*(n+1)(n+2)/n(n+3)*...*2001*2002/2000*2003
=(2*3*3*4*4*5*...**2001*2002)/(1*2*3*...*2000*4*5*6*...*2003)
=2001*3/2003
=6003/2003.

(simple calculation) 60.46 - (50.37-3.54)
The wrong number is: 6.46 - (5.37-3.54) 5.58-5 / 3 + 5024-5 / 2

Here's a detail. (of course, Zhan Long's answer is also right.) it's better to put two simple addends together in brackets:
Original formula = 6.46-5.37 + 3.54
=（6.46+3.54）-5.37
=10-5.37
=4.63
2.5.58-5 / 3 + 5024-5 / 2 what I hope to see is 3 / 5 and 2 / 5, which can be roughly calculated as follows
Original formula = 5.58 - (3 / 5 + 2 / 5) + 5024
=5.58-1+5024
=4.58+5024
=5028.58
According to 5.58-5 / 3 + 5024-5 / 2, I don't know how to make it easier

Simple calculation of 0.5 △ 0.8-0.5 △ 0.8
I need it today. I'll increase it in 30 minutes

Original formula = (0.5 △ 0.8) (1-1)
=（0.5÷0.8）*0
=0