a) 80- (4.52 - 3.23)

= 80- ( 208 -69 )

=80+139  quy tắc đổi dấu trừ tước dấu ngoặc

= 219

e: Ta có: \(2448:\left[119-\left(23-6\right)\right]\)

\(=2448:\left(119-23+6\right)\)

\(=2448:102=24\)

35 x 45 : 3 - 45 = 0

k mk nha

\(35\cdot45\div35-45=45\cdot35\div35-45=45-45=0\)

35.45:35-45=1575:35-45

                   =45-45

                   = 0

k mk nha! mk k lại cho

=4 (dư 7)

35.45 = 3.3.3.3.3.4.4.4.4.4

= (3.4).(3.4).(3.4).(3.4).(3.4)

= 12.12.12.12.12 = 125

a) 17 + 15 + (-27)

= (17 - 27) + 15

= -10 + 15

= 5

b) 13.75 + 25.13 - 300

= 13.(75 + 26) - 300

= 13.100 - 300

= 1300 - 300

= 1000

c) 80 - (4.5² - 5.2³) + 2021⁰

= 80 - (4.25 - 5.8) + 1

= 80 - (100 - 40) + 1

= 80 - 60 + 1

= 20 + 1

= 21

= 25.13 + 112.13 - 25 * 3

= 25.13 + 112.13 -   75

=      137.13        -   75

=    62.62

tk cho mình nhé

25,13 + 112,13 - 25 : \(\frac{1}{3}\)

=  25,13 + 112,13 -  75

=  137,26 - 75

=  62,26

25,13 + 112,13 - 25 : \(\frac{1}{3}\)

= 25,13 + 112,13 - 75

=       137,26  -  75

=              62,26

~~~ chúc bn hok tốt ~~~

c: \(23\cdot75+25\cdot10+25\cdot13+180\)

\(=25\left(23\cdot3+10+13\right)+180\)

\(=25\cdot98+180\)

=2450+180

=2630

\(23\cdot75+25\cdot10+25\cdot13+180\\ =23\cdot75+25\cdot\left(10+13\right)+180\\ =23\cdot75+25\cdot23+180\\ =23\cdot\left(75+25\right)+180\\ =23\cdot100+180\\ =2300+180\\ =2480\)