4.15.17=1020

5.12.17=1020

6.10.56=3360

4.15.17+5.12.17+6.10.56=1020+1020+3360=5400

K nhé MN?????????

Hok tốt!!!!!!!

4 . 15 . 17 + 5 . 12 . 17 + 6 . 10 . 56

= 17 . ( 4 . 15 + 5 . 12 ) + 6 . 10 . 56

= 17 . ( 60 + 60 ) + 6 . 10 . 56

= 17 . 120 + 6 . 10 . 56

= 2040 + 3360

= 5400

a. `17.85+15.17-120`

`=17 . (85+15)-120`

`=17 . 100-120`

`=1700-120`

`=1580`

b. `5.7^2 - 24 : 2^3`

`=5. 49 - 24: 8`

`=245-3`

`=242`

c. `3^3 .22 -27.19`

`=27.22 - 27.19`

`=27 . (22-19)`

`=27.3=81`

a = 1580

b = 242

c = 81

a: =17x100-120=1700-120=1580

a) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
b) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)

4.15.17+5.12.27+6.10.56

=(4.15).17+(5.12).27+(6.10).56

=60.17+60.27+60.56

=60.(17+27+56)

=60.100

=6 000

4 . 15 . 17 + 5 . 12 . 27 + 6 . 10 . 56

= ( 4 . 15 ) . 17 + ( 5 . 12 ) . 27 + ( 6 . 10 ) . 56

= 60 . 17 + 60 . 27 + 60 . 56

= 60 . ( 17 + 27 + 56 )

= 60 . 100

= 6000

tách ra bạn nhé

mik chỉ biết có thế thôi

2.31.12+4.42.6+8.81

=(2.12).31+(4.6).42+(8.3).(81:3)

=24.31+24.42+24.27

=24.(31+42+27)

=24.100

=2 400

easy 

a) {6000 :[219-(25-6)]}: 15 -2

  {6000 : [ 219- 19]} : 15 -2

{6000 :200 } : 15 -2

30 : 15 -2

2-2=0

b) 407-{[(180-160):4+9]:2}

407-{[20:4+9]:2}

407-{14:2}

407-7=400

c)4.15.17+5.12.27+6.10.56

1020+1620+3360

=6000

nhớ k mình nha

a.(6000:200):15-2

30-15-2=0

b.407-[(5+9):2]

407-7

400

c.60*17+60*27+60*56

60*(17+27+56)

6000

\(17\cdot85+15\cdot17+2^3\cdot3\cdot5\)

\(=17\cdot100+40\cdot3\)

\(=1700+120=1820\)