a) = 217. [(-39) + (-61)]
= 217 . -100
= -21700

\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)

Giải 

a) 5⁶⁹ : 5⁶⁷ – 3⁴⁰ : 3³⁹ = 5² – 3¹ = 25 – 3 = 22

b) 155 – [ 2 . ( 30 + 5 – 26 ) . ( 24 : 3 )]

= 155 – [ 2 . 9 . 8 ] = 155 – 144 = 11

c) 37 . 143 + 37 . 57 + 1300

= (37 . 143 + 37.57) + 1300

= 37.(143+ 57) + 1300

= 37. 200 + 1300

= 7400 + 1300

8700.

a) 569 : 567 – 340 : 339 = 52 – 31 = 25 – 3 = 22

b) 155 – [ 2 . ( 30 + 5 – 26 ) . (24 : 2 )]

= 155 – [ 2 . 9 . 8 ] = 155 – 144 = 11

c) 8700.

a)

42+69+158=(42+158)+69=200+69=269

a)  3 4 + 0,5 − 1 1 3 = 3 4 + 1 2 − 4 3 = 9 12 + 6 12 − 16 12 = − 1 12 .

b)  − 15 18 + 6 9 − 1 4 = − 5 6 + 2 3 − 1 4 = − 10 12 + 8 12 − 3 12 = − 5 12 .

= - 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

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

Đáp án cần chọn là: B

a,  (-69).35 - 69.65

= -69.( 35 + 65)

= -69 .100

= -6900

b,  377377 .545 - 377.545545

= 377 .1001.545 - 377. 545 . 1001

= 377.545.1001 - 377.545.1001

= 0