=(112+(2-5).28):28

=(112+(-84)):28

=28:28

=1

\(\left(112+2\cdot28-5\cdot28\right):28\)

\(=\left(4\cdot28+2\cdot28-5\cdot28\right):28\)

\(=28\cdot\left(4+2-5\right):28\)

\(=1\cdot\left(6-5\right)\)

\(=1\cdot1\)

\(=1\)

=(112+(2-5). 28): 28

= 112+ 2-5.1

=112+2-5

=114- 5

= 109

(28.9 + 2.28 - 5.28) : 28

=( 9 + 2 - 5) .28 : 28

= 6.(28:28)

= 6

\(\left(28.9-2.28-5.28\right):28\\ =\left[28.\left(9-2-5\right)\right]:28\\ =28.2:28\\ =28:28.2\\ =2\)

( 112 + 2.28-5.28) : 28

= ( 4.28 + 2.28 - 5.28 ) : 28

= ( 6.28-5.28 ) : 28

= 28 : 28

= 1

(112+2.28-5.28):28 

= 28 : 28 = 1

=3187

giúp mình khôi phục lại -158 nha các bạn!!!!

cảm ơn trc!!!

1, (105 :5).35 = 21.35= 735

a)38.105:5.38=(38:38).(105:5)

                      =1.21

                      =21

a) \(53.39+47.39-53.21-47.21\)

\(=39\left(53+47\right)-21\left(53+47\right)\)

\(=39.100-21.100\)

\(=3900-2100=1800\)

b) \(\left(252+2.28-5.28\right):28\)

\(=\left(9.28+2.28-5.28\right):28\)

\(=28\left(9+2-5\right):28\)

\(=28.6:28\)

\(=6\)

Bài 1:

1. 3⁶.7 + 3⁴.37 + 19.100

= 3⁴.(3².7 + 37) + 19.100

= 81.100 + 19.100

= 100.(81 + 19)

= 100.100

= 10000

2) 2.14.98+7.4.32-28.30

= 28.98 + 28.32 - 28.30

= 28. (98 + 32 - 30)

= 28.100

= 2800

3) (56.35+56.18):53

= [56.(35 + 18)] : 53

= 56.53:53

= 56

4) (158.129-158.39):28

= [158. (129 - 39)] : 28

= 158.90:28

= 5,675

Các bạn hãy trả lời nhanh giúp mìk

5)123.456+456.321-256.444

= 456. (123 + 321) - 256.444

= 456 . 444 - 256.444

= 444.(456 - 256)

= 444.200

= 88800

6) (252+2.28-5.28):28

= (9.28 + 2.28 - 5.28) : 28

= 28.(9 + 2 - 5) : 28

= 28.6:28

= 6.

( 252 + 2.28 - 5.28 ) : 28

= ( 252 + 56 - 140 ) : 28

=  ( 308 - 140 ) : 28

=           168   :   28

=                  6

=6 nha

(252+2.28-5.28):28=6

Học tốt

\(\left(252+2\cdot28-5\cdot28\right):28\)

\(=\left(28\cdot9+2\cdot28-5\cdot28\right):28\)

\(=28\cdot\left(9+2-5\right):28\)

\(=6\)

(252+2.28-5.28):28

=252:8+2.28:28-5.28:28

=9+2-5

=6

  (252+2*28-5*28):28

= (28*9+2*28-5*28):28

= 28*(9+2-5):28

= 28*6:28

=28:28*6

=1*6

=6

ủng hộ mk nha mn

(252+2*28-5*28):28

\(=\left(9x28+2x28-5x28\right):28\)

\(=\left[28\left(9+2-5\right)\right]:28\)

\(=28x6:28\)

\(=6\)

Lời giải 

\(=\left[28.\left(252+2-5\right)\right]:28\)

\(=\left[28.249\right]:28\)

\(=6972:28\)

\(=249\)

 (252 +2 x 28 - 5 x 28 ) : 28

= (9 x 28 + 2 x 28 - 5 x 28 ) : 28

= [(9+2-5) x 28 ] : 28

=(6x28) : 28

= 6 x 28 : 28

= 6 x    1 

= 6