\(=2020-\left(45-25\right)+1=2020-20+1=2001\)

2001

\(=2020-\left(45-5^2\right)+1=2021-20=2001\)

câu 1:

\(\left\{1;2;...;11\right\}\)

\(\left\{x\in N;0< x\le11\right\}\)

câu 2:

a) \(=416-\dfrac{189}{32}=\dfrac{13123}{32}\)

b) dãy trên có số hạng là: \(\left(90-12\right):3+1=27\)(số)

tổng dãy số trên là:\(\left(90+12\right).27:2=1377\)

c) \(=2020-\left(45-5^2\right)+1=2020-20+1=2001\)

help my

a; 2³.17 + 2³.83 - 14

= 2³.(17 + 83) - 14

= 8.100 - 14

= 800 - 14

= 786 

b; -176 + 197 - (-76 + 97)

= -176 + 197 + 76 - 97

= -(176 - 76) + (197 - 97)

= - 100 + 100

= 0 

c; 2022 - [45 - (6 - 1)² ] + 2021⁰

= 2022 - [45 - 5²] + 1

= 2022 + 1 - [45 - 25] 

= 2023 - 20

= 2003

a) \(2^3.17+2^3.83-14\)

\(=2^3.\left(17+83\right)-14\)

\(=8.100-14\)

\(=800-14\)

\(=786\)

b) \(-176+197-\left(-76+97\right)\)

\(=-176+197+76-97\)

\(=\left(-176+76\right)+\left(197-97\right)\) 

\(=-100+100\)

\(=0\)

c) \(2022-\left[45-\left(6-1\right)^2\right]+2021^0\)

\(=2022-\left[45-5^2\right]+1\)

\(=2022-\left[45-25\right]+1\)

\(=2022-20+1\)

\(=2002+1=2003\)

lỗi rồi

lỗi

lỗi r

a) (x - 15) × 7 - 270 : 45 = 169

(x - 15) × 7 - 6 = 169

(x - 15) × 7 = 169 + 6

(x - 15) × 7 = 175

x - 15 = 175 : 7

x - 15 = 25

x = 25 + 15

x = 40

b) [(4x + 28) × 3 + 55] : 5 = 35

(4x + 28) × 3 + 55 = 35 × 5

(4x + 28) × 3 + 55 = 175

(4x + 28) × 3 = 175 - 55

(4x + 28) × 3 = 120

4x + 28 = 120 : 3

4x + 28 = 40

4x = 40 - 28

4x = 12

x = 12 : 4

x = 3

c) (455 × x : 2 × 6) : 5 = 31

455 × x : 2 × 6 = 31 × 5

455 × x : 2 × 6 = 155

x × 455 : 2 × 6 = 155

x × 1365 = 155

x = 155 : 1365

x = 31/273

d) 128 × x - 12 × x - 16 × x = 520800

(128 - 12 - 16) × x = 520800

100 × x = 520800

x = 520800 : 100

x = 5208

e) (x × 0,25 + 2022) × 2023 = (50 + 2022) × 2023

(x × 0,25 + 2022) × 2023 = 2072 × 2023

(x × 0,25 + 2022) × 2023 = 4191656

x × 0,25 + 2022 = 4191656 : 2023

x × 0,25 + 2022 = 2072

x × 0,25 = 2072 - 2022

x × 0,25 = 50

x = 50 : 0,25

x = 200

f) 4 × x + 100 = x + 280

4 × x - x = 280 - 100

(4 - 1) × x = 180

3 × x = 180

x = 180 : 3

x = 60

g) (x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 7450

x + 1 + x + 2 + x + 3 + ... + x + 100 = 7450

100 × x + 100 × 101 : 2 = 7450

100 × x + 5050 = 7450

100 × x = 7450 - 5050

100 × x = 2400

x = 2400 : 100

x = 24

A

nhầm D

D

Ta có: 2022⁴⁵-2022⁴⁴=2022⁴⁴.(2022^45-44-1)=2022⁴⁴.(2022-1)=2022⁴⁴.2021

2022⁴⁴-2022⁴³=2022⁴³.(2022^44-43-1)=2022⁴³.(2022-1)=2022⁴³.2021

Vì 2022⁴⁴.2021>2022⁴³.2021 nên 2022⁴⁵-2022⁴⁴>2022⁴⁴-2022⁴³

\(2022^{45}-2022^{44}=2022^{44}\cdot2021\)

\(2022^{44}-2022^{43}=2022^{43}\cdot2021\)

mà 44>43

nên \(2022^{45}-2022^{44}>2022^{44}-2022^{43}\)

c: =25-4+1=26-4=22

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