Simple calculation of (- 2) + 4 + (- 6) + 8 +... + (- 98) + 100

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1. 2 by 1 in 4 plus 4 by 1 in 6 plus 6 by 1 in 8 plus ellipsis plus 98 by 1 in 100, please
2. Two times one in four plus four times one in six plus six times one in eight What is 98 times one in 100
3. Simple operation of 23.2 times 7 / 8
4. 1 / 2 × 5 + 1 / 3 × 5 + 1 / 8 × 11 + +Simple calculation of 20 × 1 / 23
5. 9 out of 20 divided by 11 out of 2 (2 out of 5 plus 4 out of 5), easy calculation
6. Simple operation of 1 / 2 + 1 / 5 + 1 / 8 + 1 / 11 + 1 / 20 + 1 / 41 + 1 / 110
7. How to calculate 4 out of 7 times 5 plus 2 out of 7 times 6 plus 1 out of 7 times 24 with a simple algorithm Come and help me
8. Please use 5,4, - 2, - 6 to calculate 24. There are several algorithms Must add, subtract, multiply, divide, brackets all applied to the formula
9. 8 2 4 6 how to calculate to 24 with four methods
10. 5871 / 103 + (247 + 82) / 5-1 simple algorithm
11. 2／2×4＋2／4×6＋2／6×8＋…… + 2 / 98 × 100 =? What is the simple calculation method?
12. 5000-2-4-6… -98-100=______ ．
13. How about three fifths by one sixth by five Sevens?
14. Simple calculation 2 and 3 / 4 minus (20% + 1 / 3) * 4.5
15. How to calculate 5.3 times 7.5 minus 7.5 times 3.3
16. One third minus one fourth plus three quarters how to calculate? The fastest right plus 10 points I know it's five sixths, but I want to make sure it's easy to calculate!
17. 1. Calculate 1 / 4 + 3 / 8 + 4 / 10 = 3 / 4 + 3 / 7 = 3 / 8 + 5 / 12= 1. Calculation 1 / 4 + 3 / 8 + 4 / 10= 3 / 4 + 3 / 7= 3 / 8 + 5 / 12= 1 / 3-1 / 4= 1 / 2 + 1 / 5= 1 / 6-1 / 7= 1 / 5 + 1 / 6= 1 / 7-1 / 8= 1 in 8 + 1 in 9= 1 / 2-1 / 3= 1 / 9 + 1 / 10=
18. The result of calculating 2 and 3 / 7 + (- 5) is_______ . calculation 5 / 12 - (1 / 2-3 / 4-7 / 12)
19. When the numerator and denominator of 7 / 3 in 1991 are added with?, the score is 1 / 3?
20. How to add different denominators? 7-7 / 8 + 3 / 8