A=(27+53)+(46+34)+79

A=80+80+79

A=160+79

A=239

B = -377 - (98 - 277)

B=-377-98-277

B=[(-377)+277]-98

B=(-100)-98

B=-198

C= -1,7.2,3 + 1,7.(-3,7) - 1,7.3 - 0,17 : 0,1

C=1,7.(-2.3)+1,7.(-3,7)+1,7.(-3)+1,7

C=1,7.[(-2,3+(-3,7)+(-3)+1]

C=1,7.(-8)

C=-13,6

Còn  mái câu kia mk hk pít lm pn th/cảm cho mk nhae

C = –1,7 . 2,3 + 1,7 . (–3,7) – 1,7 . 3 – 0,17 : 0,1.

= –1,7 . 2,3 – 1,7 . 3,7 – 1,7 . 3 – 0,17 .10

= –1,7 . 2,3 – 1,7 . 3,7 – 1,7 . 3 – 1,7.

= –1,7 . (2,3 + 3,7 + 3 + 1)

= –1,7 . 10 = –17.

Bài 1: 

a) Ta có: \(A=-1.7\cdot2.3+1.7\cdot\left(-3.7\right)-1.7\cdot3-0.17:0.1\)

\(=1.7\cdot\left(-2.3\right)+1.7\cdot\left(-3.7\right)+1.7\cdot\left(-3\right)+1.7\cdot\left(-1\right)\)

\(=1.7\cdot\left(-2.3-3.7-3-1\right)\)

\(=-10\cdot1.7=-17\)

b) Ta có: \(B=2\dfrac{3}{4}\cdot\left(-0.4\right)-1\dfrac{2}{3}\cdot2.75+\left(-1.2\right):\dfrac{4}{11}\)

\(=\dfrac{11}{4}\cdot\left(-0.4\right)-\dfrac{5}{3}\cdot\dfrac{11}{4}+\left(-1.2\right)\cdot\dfrac{11}{4}\)

\(=\dfrac{11}{4}\left(-0.4-\dfrac{5}{3}-1.2\right)\)

\(=-\dfrac{539}{60}\)

c) Ta có: \(C=\dfrac{\left(2^3\cdot5\cdot7\right)\cdot\left(5^2\cdot7^3\right)}{\left(2\cdot5\cdot7^2\right)^2}\)

\(=\dfrac{2^3\cdot5^3\cdot7^4}{2^2\cdot5^2\cdot7^4}\)

\(=10\)

A = 27 + 46 + 79 + 34 + 53 = 239

B = - 377 - (98 - 277)

= - 377 - 98 + 277

= -198

C = - 1,7× 2,3 + 1,7.× (- 3,7) - 1,7×3 - 0,17:0,1

= 1,7. (-2,3 – 3,7 – 3 – 1)

= 1,7 . (-10)

= -17.

D = $2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}$

$=\frac{11}{4}.\frac{-4}{10}-\frac{8}{5}.\frac{11}{4}+\frac{-6}{5}.\frac{11}{4}$

$=\frac{11}{4}.\left(\frac{-4}{10}-\frac{8}{5}+\frac{-6}{5}\right)$

$=\frac{11}{4}.\frac{-2-8-6}{5}$

$=\frac{11}{4}.\frac{-16}{5}$

$=\frac{-44}{5}$

a=239

b=-198

c=-17

d=-44/5

e=10

-1,7.2,3+1,7.(-3,7)-1,7.3-0,17:0,1

.=1,7.(-2,3)+1,7.(-3,7)-1,7.3-0,17:0,1

=1,7.[(-2,3)+(-3,7)]-1,7.3-(0,17:0,1)

=1,7.(-6)-1,7.3-1,7

=1,7.[(-6)-3-1]

=1,7.(-10)

=-17

-1,7 . 2,3 + 1,7 . (-3,7) - 1,7 . 3 - 0,17 : 0,1

= 1,7 . (-2,3) + 1,7 . (-3,7) - 1,7 . 3 - 0,17 . 10

= 1,7 . (-2,3) + 1,7 . (-3,7) - 1,7 . 3 - 1,7 . 1

= 1,7 . [(-2,3) + (-3,7) - 3 - 1]

= 1,7 . (-10)

= -17

\(-1.7\cdot2.3+1.7\cdot\left(-3.7\right)-1.7\cdot3-0.17:0.1\)

\(=\dfrac{-17}{10}\cdot\dfrac{23}{10}+\dfrac{17}{10}\cdot\left(\dfrac{-37}{10}\right)-\dfrac{17}{10}\cdot3-\dfrac{17}{100}:\dfrac{1}{10}\)

\(=\dfrac{-17}{10}\cdot\dfrac{23}{10}+\dfrac{17}{10}\cdot\left(\dfrac{-37}{10}\right)-\dfrac{17}{10}\cdot3-\dfrac{17}{100}\cdot10\)

\(=\dfrac{-391}{100}+\dfrac{-629}{100}-\dfrac{51}{10}-\dfrac{17}{10}\)

\(=\dfrac{-391}{100}+\dfrac{-629}{100}-\dfrac{510}{100}-\dfrac{170}{100}\)

\(=\dfrac{-391+\left(-629\right)-510-170}{100}\)

\(=\dfrac{-1700}{100}=-17\)

=-12,71

giai day du ho cai

= - 12 . 71