a) 7/-25+8/25 ; 4/5+4/-18 ; 7/21+9/-36

b) 12/20-2/5 ; 2/3-(-5/6) ; 6-3/20

c)2/21*(-7/3) ; 27/28*(-21) ; -15/7*(-14/25)

ai nhanh mk tk cho giup k nhe minh can gap

a,(100.5^7+5^11:25):(5.5^13:25^2)

b,(3^12+3^11):3^10

c,(2^43+2^4):(2^20+1)

d,(2^22+2^24+2^25):(2^18+2^19+2^20)

e,7.3^9+3^10+51.3^8

7^91:7^89+5.5^2-124

4.15+28:7-6^20:6^18

(3^2+2^3):7

11^25:11^23-3^5:(1^10+2^3)-60

5^20:(5^5.6+5^15.19)

Tính

\(2:\left(\frac{1}{2}-\frac{2}{3}\right)^3\)

\(\frac{5^4}{25^5}.\frac{20^4}{4^5}\)

\(\left(\frac{-10}{3}\right)^5.\left(\frac{-6}{5}\right)^4\)

\(\frac{7^5.5^7}{35^7}\)

Giúp mk vs huhuhu ToT

Viết số thích hợp vào chỗ chấm:

5:1=…                  5:5=…                  25:5=… 

5×3=…                 15:5=…      15:3=…

5×2=…                 10:5=…      10:2=…

5×4=…      20:5=…      20:4=…

1.

1=5

2=10

3=15

4=20

5=25

6=?

ai lm đầu tiên mk sẽ tk cho

1) 15 - 98 + 91 - 75 + 98 - 91 - 13

2) 5 - ( 4 - 7 + 12 ) + ( 4 - 7 + 12 ) - 10

3) 20 - ( 25 - 98 + 12 ) + ( 25 - 98 - 72 )

4) - ( 17 - 4 + 13 + | -17 | + 13 )

5) | -16 | - ( 5 - 8 + 7) - ( - 5 ) - 8

6) -20 + ( 3 - 16 + 7 ) - ( 3 - 16 + 7 )

7) 32 - ( 5 - 8 + 32 ) + ( 5 - 8 + 6 )

8) -20 - ( 25 - 11 + 8 ) + ( 25 - 8 + 20 )

tính hợp lí

5/6+ 41/6. ( 225/20- 37/4) : 25/3

Cho C= \(\frac{2}{3}\times\frac{4}{5}\times\frac{6}{7}\times...\times\frac{19}{20}.\)\(CMR:C< \frac{1}{201}\)

Lm ơn giúp tớ vs, tớ tk cho mak