TA có: \(450\%+3\frac14-2,75+2\frac{3}{10}+2,7\)

=4,5+3,25-2,75+2,3+2,7

=4,5+0,5+5

=5+5

=10

1. \(450\%+3=\dfrac{9}{2}+3=\dfrac{15}{2}\)

2. \(\dfrac{1}{4}-2,75+2=0,25-2,75+2=-0,5\)

3. \(\dfrac{3}{10}+2,7=0,3+2,7=3\)

`450%+3 1/4 -2,75+ 2 3/10 +2,7`

`->4,5+3,25−2,75+2,3+2,7`

`->[(4,5+3,25)−2,75]+(2,3+2,7)`

`->[7,75-2,75]+5`

`->5+5->10`

\(=\dfrac{9}{2}+\dfrac{13}{4}-\dfrac{11}{4}+\dfrac{23}{10}+\dfrac{27}{10}\\ =\dfrac{9}{2}+\dfrac{1}{2}+5\\ =5+5=10\)

a: \(2,5-\frac{-10}{15}=\frac52+\frac23\)

\(=\frac{15}{6}+\frac46=\frac{19}{6}\)

b: \(6,25+\left\lbrack1,75-\left(0,75-2,75\right)\right\rbrack\)

=6,25+1,75+(2,75-0,75)

=8+2

=10

c: \(\frac{8^5\cdot27^2}{3^7\cdot32^4}=\frac{\left(2^3\right)^5\cdot\left(3^3\right)^2}{3^7\cdot\left(2^5\right)^4}=\frac{2^{15}}{2^{20}}\cdot\frac{3^6}{3^7}=\frac{1}{3\cdot2^5}=\frac{1}{96}\)

d: \(2\frac35\cdot\left(-2021\right)-235,91+0,55\cdot94\)

\(=-2021\cdot2,6-235,91+51,7\)

=-5254,6-235,91+51,7

=-5438,81

-11/5 có cần cách giải ko? Nhân tiện chúc bn năm ms zui zẻ nhé!!!!!!!!!!!!!!!!!!!!

0,9 x 2 + 1,8 x 3 + 2,7 x 4

=>1,8 + 5,4 + 10,8

=>7,2 + 10,8 = 18

= 0,9 x 2 + 0,9 x 2 x 3 + 0,9 x 3 x 4

= 0,9 x 2 + 0,9 x 6 + 0,9 x 12

= 0,9 x (2 + 6 + 12)

= 0,9 x 20

= 0,9 x 10 x 2 

= 9 x 2 

= 18

Câu a:

3^2.10^3 - [13^2 - (5^2.4 + 2^2.15)].10^3

= 10^3.(3^2 - 13^2 + 5^2.4 + 2^2.5)

= 10^3.(9 - 169 + 100 + 60)

= 10^3.(-160 + 100 + 60)

= 10^3.(-60 + 60)

= 10^3.0

= 0

Câu b:

600: {450 :[450 - (4.5^3 - 2^3.5^2)]}

= 600 : {450 :[450 - (4.125 - 8.25)]}

= 600 :{450 : [450 - (500 - 200)]}

= 600:{450 :[450 - 300]}

= 600: {450 : 150]

= 600 : 3

= 200