a) $34-29+(-14)+129-(-114)$

$=34-29-14+129+114$

$=34+(129-29)+(114-14)$

$=34+100+100$

$=234$

b) $27\cdot(-35)+(-27)\cdot64-27$

$=(-27)\cdot35+(-27)\cdot64+(-27)\cdot1$

$=(-27)\cdot(35+64+1)$

$=(-27)\cdot(99+1)$

$=(-27)\cdot100$

$=-2700$

c) $160-(4\cdot5^2-3\cdot2^3)\cdot2-(-12)$

$=160-(4\cdot25-3\cdot8)\cdot2+12$

$=160-(100-24)\cdot2+12$

$=160-76\cdot2+12$

$=160-152+12$

$=160-(152-12)$

$=160-140$

$=20$

a, 34 - 29 + (-14) + 129 - (-114)

= 34 + (129 - 29) + (114  - 14)

= 34 + 100 + 100

= 234

b, 27.(-35) + (-27).64 - 27

= (-27).(35 + 64 + 1)

= - 27 . 100

= - 2700

c, 160 - (4.5² - 3.2³).2 - (-12)

= 160 - (4.25 - 3.8).2 + 12

=  160 - (100 - 24).2 + 12

=  160 - 76.2 + 12

= 160 - 152 + 12

= 8 + 12

= 20 

a, 34-29+(-14)+129-(-114)
= 34-29-14+129+114
= (34-14)+(-29+129)+114
= 20 + 100 + 114
= 234

a)  80 - (4.5² - 3.2³ )

= 80 - ( 4 . 25 - 3. 8 ) 

= 80 - ( 100 - 24 )

= 80 - 76 = 4 

b) 5⁶ : 5⁴ + 2³ . 2² - 1²⁰¹⁷ 

= 5² + 2⁵ - 1 

= 25 + 32 - 1 

= 57 -1 = 56 

a) 80 - (4.5² - 3.2³)

= 80 - (4.25 - 3.8)

= 80 - (100 - 24)

= 80 - 76

= 4

b) 5⁶ : 5⁴ + 2³ . 2² - 1²⁰¹⁷

= 5² + 2⁵ - 1

= 25 + 32 - 1

= 56

Chúc bạn học tốt!! ^^

a,  80 - 4 . 5 2 - 3 . 2 3

= 80 – (4.25 – 3.8)

= 80 – 76 = 4

b,  5 6 : 5 4 + 2 3 . 2 2 - 1 2018

=  5 2 + 2 5 - 1

= 25 + 32 – 1 = 56

c, [36.4 – 4. 82 - 7 . 11 2 ]:4 –  2019 0

= (144 – 4. 5 2 ):4 – 1

= (144 – 100):4 – 1

= 11 – 1 = 10

d, 303 – 3.{[655 – (18:2+1). 4 3 +5]}: 10 0

= 303 – 3.(655 – 10.64 + 5):1

= 303 – 10 = 293

a) 80-(4.5²-3.2³)=80-100+24=4

b)[36.4-4.(82-7.11)²]:4-2019⁰

={4.[36-(82-7.11)²]}:4-1

=[36-(82-7.11)²]-1

=11-1=10

c)5⁶:5⁴+2³.2²-1²⁰¹⁸

=5²+2⁵-1

=25+32-1=56

d)303-3.{[655-(18:2+1).4³+55]}:10⁰

=303-3.[(655-9-1).4³+55]:1

=303-3[655-640+5]

=303-3(20)

=303-60=243

a) \(3.5^2-16:2^2\)

\(=3.25-16.4\)

\(=75-64\)

\(=11\)

b) \(17.85+15.17-120\)

\(=17.\left(85+15\right)-120\)

\(=17.100-120\)

\(=1700-120\)

\(=1580\)

c) \(\left(3^{15}.4+5.3^{15}\right):3^{16}\)

\(=\left[3^{15}.\left(4+5\right)\right]:3^{16}\)

\(=\left[3^{15}.9\right]:3^{16}\)

\(=\left[3^{15}.3^2\right]:3^{16}\)

\(=3^{17}:3^{16}\)

\(=3\)

a. 3.5² - 2⁴ : 2² = 3.5²- 2² = 3.25-4= 75-4 =71

b. 17.(85+15) - 120 = 17.100-120=1700-120=1580

c. |3¹⁵.(4+5)| :3¹⁶= (3¹⁵.9) : 3¹⁶= 3¹⁵.3² : 3¹⁶= 3¹⁷:3¹⁶=3

dấu | là ngoặc vuông bn nhé

a, 3.5^2-16:2^2

=3.25-16:4

=75-4

=71

b, 17.85+15.17-120

=17.(85+15)-120

=17.100-120

=1700-120

=1580

c, (3^15.4+5.3^15):3^16

=[3^15.(4+5)]:3^16

=(3^15.9):3^16

=(3^15.3^2):3^16

=3^17:3^16

=3^1

=3

a) 4.5²-3.2³ = 2².5²-3.2³ = 2².(5²-3.2) =2².(25-6) = 4.19 = 76

b) 28.76 + 13.28 + 9.2

= 28. (76 + 13) + 18

= 28. 89 + 18

= 2492 + 18

= 2510

c) 1024: ( 17 .2⁵+15.2⁵)

= 2¹⁰ : [2⁵.(17+15)]

= 2¹⁰: [2⁵. 32]

= 2¹⁰: [2⁵.2⁵)

= 2¹⁰:2¹⁰

= 1

a) 4.5²-3.2³

=2².5²-3.2³

=2².(25-6)

=4.11

=44
 b) 28.76+13.28+9.2

=28.(76+13)+9.2

=28.89+9.2

=2.(1246+9)

=2.1255

=2510
 c) 1024:(17.2⁵+15.2⁵)

=1024:2⁵.(17+15)

=1024:32.32

=1

Thanks 

Câu 15:

\(A=2+2^2+2^3+...+2^{100}\)

\(=2\left(1+2\right)+...+2^{99}\left(1+2\right)\)

\(=6\cdot\left(1+...+2^{98}\right)⋮6\)

Đáp án:

Bài 1 :

1) 30.75 + 25.30 – 150

= 30.(75+25) -150

= 30.100 -150

= 3000 -150

= 2850

2) 160 - (4.5² - 3.2³)

= 160 – ( 4.25 – 3.8)

= 160 – (100 – 24)

= 160 – 76

= 84

3) [36.4 - 4.(82 - 7.11)²] : 4 - 2022⁰

= [36.4 – 4.(82 – 7.11)²] :4 - 1

= [36.4 – 4.(82 – 77)²] : 4 – 1

= [36.4 – 4.5²] : 4 – 1

=[36.4 – 4.25] : 4 – 1

=[4. (36 – 25)] : 4 – 1

= [4. 11] : 4 – 1

=44 : 4 – 1

=11 – 1

= 10

Đây nha bạn!!!

Chúc bạn học tốt!!!

=1/5+2/5+51/85+4/5

=7/5+51/85

=119/85+51/85

=170/85=2

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