24 points: 25 5 10; 28 9 13; 34 6 13; 34 8 13; 27 12 13 most urgent!

24 points: 25 5 10; 28 9 13; 34 6 13; 34 8 13; 27 12 13 most urgent!

2 8 9 13:(13-9)*(8-2)=24
3 4 8 13:(13-4)/3*8=24
2 7 12 13:(13-7)*2+12=24

-3,13,12, - 13! 24 negative numbers
There are four numbers - 3,13,12, - 13, which are negative numbers and 24 points. They can't be the result - 24. They must be positive numbers and the result is 24!

-3,13,12,-13
12×[13÷（-13）-（-3）]
=12×[-1-（-3）]
=12×2
=24

13,12,1,3 are 24

(12X3)-(13-1)=24~
HOHO~

18. 24, 16, 9 and 5 are 60 points
Each number can only be used once and cannot be repeated! It cannot be (16-9-5) * 18 + 24

(18-16*9÷24)*5=60

How to calculate 24 with 16 5 18 8?

((16+5)-18)*8
(16+(5-18))*8
(16-(18-5))*8
((16-18)+5)*8
((5+16)-18)*8
(5+(16-18))*8
(5-(18-16))*8
((5-18)+16)*8
8*((16+5)-18)
8*(16+(5-18))
8*(16-(18-5))
8*((16-18)+5)
8*((5+16)-18)
8*(5+(16-18))
8*(5-(18-16))
8*((5-18)+16)

Calculation [- 16] - [- 12] - 24 - [- 18]

【-16】-【-12】-24-【-18】
=-16+12-24+18
=-4-24+18
=-28+18
=-10

Calculation: - 16 + 18 - (- 24) = ()

26

Simple calculation of 12.5 -- 8.5 △ 0.85

=12.5-10
=2.5

Calculation 12 + 16 + 112 + 120 + 130 + 142=______ ．

12 + 16 + 112 + 120 + 130 + 142 = (1 − 12) + (12 − 13) + (13 − 14) + (14 − 15) + (15 − 16) + (16 − 17), = 1 − 17, = 67

One half plus one sixth plus one twelfth plus one twentieth plus one thirty plus one forty-two plus one fifty-six plus one seventy-two

One half plus one sixth plus one twelfth plus one twentieth plus one thirty plus one forty-two plus one fifty-six
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8
If you understand and solve your problem,