= - 69 bn nha

tk cho mk đi

(42-69+17)-(42+17)

=44-69+17+42+17

=(42-42)-(17-17)-69

=0-0-69

=-69

ai k mình mình k lại

(42-69+17)-(42+17)

=42-69+17-42-17

=(42-42)+(17-17)+69

=0+0+69

=69

Thực hiện phép tính: 

( 42 - 69 + 17 ) - ( 42 + 17) 

= 42 - 69 + 17 - 42 + 17 

= ( 42 - 42) - ( 17 -  17 ) - 69 

= 0 - 0 - 69 

= - 69 

Ủng hộ nha! :) 

( 42 - 69 + 17 ) - ( 42 + 17 )

= 42 - 69 + 17 - 42 - 17

= 42 - 42 + 17 - 17 - 69

= 0 + 0 - 69

= - 69

\(\left(42-69+17\right)-\left(42+17\right)\)

\(=\left(42-42\right)-\left(17-17\right)-69\)

\(=0-0-69\)

\(=-69\)

a, 158(158+85)+42^2=158.243+1764=38394+1764=40158

b, 0,57(0,57+0,86)+0,43^2+99.101=0,57.1,43+0,1849+9999=10000

c, 69(69+63)+961=69.132+961=100069

d, 35(35^2-45.20)-3375=11375-3375=8000

e, 4,15(4,15^2-4,15.3,45

nhầm = -69

\(\left(42-69+17\right)-\left(42+17\right)=42-69+17-42-17=-69\)

(42-69+17)-(42+17)

=44-69+17+42+17

=(42-42)-(17-17)-69

=0-0-69

=-69

               Ai k mình mình k lại

lỗi ảnh , up lại câu  hỏi

lỗi

Lỗi bạn nhé :)

\(25\cdot69+31\cdot25-150\)
\(=25\cdot\left(69+31\right)-150\)
\(=25\cdot100-150\)
\(=2500-150\)
\(=2350\)

= 25 . ( 69 + 31 ) -150

= 25 . 100 - 150

= 2500 - 150 = 2350

=(25.69+31.25)-150

=25(69+31)-150

=25.100-150

=2500-150

=24850

222+ 967 +178 -267 +209

= (222 + 178) + (967 - 267) +209

= 400+700+209

= 1309 

8.25.29. 2^2.125

= 8. 25. 29. 4. 125

=(25.4) . (8. 125) .29

=100. 1000. 29

= 2900000

\(\text{222+967+178-267+209}=1309 \)
\(\text{8.25.29.2^2.125=2^3}.5^2.29.2^2.5^3=2^5.5^5.29=10^5.29=2900000\)

222+ 967 +178 -267 +209

= (222 + 178) + (967 - 267) +209

= 400+700+209

= 1309

8.25.29. 2^2.125

= 8. 25. 29. 4. 125

=(25.4) . (8. 125) .29

=100. 1000. 29

= 2900000

a) (3a + 1)³ = (3a)³ + 3.(3a)².1 + 3.3a.1² + 1³

                   = 27a³ + 27a² + 9a + 1

b) (4 - 2b)³ = 4³ - 3.4².2b + 3.4.(2b)² - (2b)³

                   = 64 - 96b + 48b² - 8b³