17.85 + 15.17 - 120 

= 1445 + 255 -120 

=1700 - 120  

=1580 

a/17.85+15.17-120

=120.[(17-17).(85+15)]

=120.          0

=0

17.85+15.17-120

=[85+15].17-120

=100.17-120

=1700-120

=1480

a: 3*5^2-16:2^2

=3*25-16:4

=75-4=71

b: =2^3(17-14)

=8*3

=24

c: =15(141+59)

=15*200

=3000

d: =17(85+15)-200

=1700-200

=1500

f: =3+2^5

=3+32

=35

g: =42(39-37):42

=39-37

=2

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) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)

c) \(2^3\cdot17-2^3\cdot14\)
\(=8\cdot17-8\cdot14\)
\(=8\cdot\left(17-14\right)\)
\(=8\cdot3\)
\(=24\)

a: 86+357+14

=100+357

=457

b: \(3\cdot52-16:22\)

\(=156-\dfrac{8}{11}=\dfrac{1708}{11}\)

`a, 3.5^2 -16:2^2`

`= 3. 25 - 16:4`

`= 75 - 4`

`=71`

_____

`b, 15.141 +59 . 15`

`= 15. (141+59)`

`=15. 200`

`=3000`

______

`c, 2^3 . 17 - 2^3 .14`

`= 2^3 . (17-14)`

`= 8 . 3`

`=24`

a: =3^7*3^15*3^12=3^34

b: =(36:18)^5=2^5=32

c: =5^7-5^5=5^5(5^2-1)=5^5*24=75000

d: =5^12:5^8=5^4=625

a: =3*25-16:4

=75-4=71

b: =15(141+59)

=15*200=3000

c: =2^3(17-14)=2^3*3=24

a) 17. 85 + 15 . 17 = 300

= 17. 9 85 = 15) + 300

= 2000

b) 72. 121 + 27 .121 = 121

= 121 . ( 72 + 27 = 1)

= 12100

c) 32. 39 + 52 . 21 - 12 . 39 + 21 . 48

= ( 32 - 12).39 + 21. ( 52 + 48)

= 2880

d) 47 - ( 45.24 - 52.12) : 14

= 47 - ( 45 . 16 - 25.12) : 14

= 17

e) 102 - 60 : ( 54 : 52 - 3. 5)

= 100 - 60 : ( 25 - 15)

= 100 - 6

= 94

17.85 + 15.17 – 120 = 17.(85 + 15) – 120 = 17.100 – 120 = 1700 – 120 = 1580

a.\(4.5^2-3.2^3+3^3:3^2=4\left(5^2-3.2\right)+3=4.19+3=79\)

b.\(28.76+24.28-28.20=28\left(76+24-20\right)=28.80=2240\)

1482241