56 x 33= 1848

88 x 88= 7744

97 x 45= 4365

46 x 33= 1518

67 x 43= 2881

30 x 15= 450

1. 33+45=78

2. 43+56=99

3. 32+78=110

4. 43+67=110

5. 22+22=44

33+45=78

43+56=99

32+78=110

43+67=110

22+22=44

CHÚC BẠN HỌC TỐT !

1 Tính :

1. 33 + 45 = 78

2 . 43 + 56 = 99

3 . 32 + 78 = 110

4 . 43 + 67 = 110

5 . 22 + 22 = 44

\(=\dfrac{32}{21}\cdot\dfrac{22}{16}\cdot\dfrac{49}{45}\cdot\dfrac{5}{11}\)

\(=\dfrac{32}{16}\cdot\dfrac{22}{21}\cdot\dfrac{5}{11}\cdot\dfrac{49}{45}\)

\(=2\cdot\dfrac{49}{45}\cdot\dfrac{22}{11}\cdot\dfrac{5}{21}\)

\(=4\cdot\dfrac{49}{21}\cdot\dfrac{5}{45}=4\cdot\dfrac{1}{9}\cdot\dfrac{7}{3}=\dfrac{28}{27}\)

https://hoc24.vn/cau-hoi/a-929-135-569-b-587-319-307c-23-13-x-94-1312d-418-74-115e-47819-54-66819-54f-3221-x-4945-1622-x-1533g-2020x20189-2019x2020-2011giup-minh-voi-m.8283379351991

bn đừng đăng lại câu hỏi đã có ctrl nhé.

\(\dfrac{32}{21}\times\dfrac{49}{45}:\dfrac{16}{22}\times\dfrac{15}{33}\)

\(=\dfrac{32}{21}\times\dfrac{49}{35}\times\dfrac{22}{16}\times\dfrac{15}{33}\)

\(=\dfrac{2\times16\times7\times7\times2\times11\times3\times5}{3\times7\times5\times7\times16\times3\times11}\)

\(=\dfrac{2\times2}{3}\)

\(=\dfrac{4}{3}\)

a) 70 - 5(x - 3 ) = 45

5( x - 3 ) = 70 - 45 = 25

x - 3 = 25 : 5 = 5

x = 5 + 3 = 8

b) (2x - 1 )⁴ = 3 . 6² - 27

(2x - 1 )⁴ = 3 . 36 - 27

(2x - 1 )⁴ = 81

 Ta thấy 81  = 3⁴ vậy suy ra (2x - 1)⁴ = 3⁴

 Để vế trong ngoặc tròn (2x - 1 ) = 3 thì x cần bằng 2

Thử lại : 2 . 2 - 1 = 4 - 1 = 3

Vậy x = 2

c) 3x³ +  43 = 10² - 33

3x³ + 43 = 100 - 33 = 67

3x³ = 67 + 43 = 110 ( Đoạn này đề bài sai hay tao sai z :)?)

a: 3x=81

nên x=27

b: \(5\cdot4^x=80\)

\(\Leftrightarrow4^x=16\)

hay x=2

c: \(2^x=4^5:4^3\)

\(\Leftrightarrow2^x=2^4\)

hay x=4

a,x+(-45)=(-62)+17

<=>x=(-62)+17+45

<=>x=0

b,x+29=\(|-43|\)-+(-43)

<=>x=43-43-29

<=>x=-29

c,43+(9-21)=317-(x+317)

<=>31=317-x-317

<=>31=-x

<=>-31=x

d, (15-x)+(x-12)=7-(-5-x)

<=>15-x+x-12=7+5+x

<=>3=12+x

<=>-9=x

e, x-{57-[42+(-23-x)]}=13-{47+[25-(32-x)]}

<=>x-57+42-23-x=13-47-25+32-x

<=>76=-27-x

<=>103=-x

<=>-103=x

f,\(|x|+|-4|=7\)

<=>\(|x|\)+4=7

<=>\(|x|\)=3

<=>x=3 hoặc x=-3

a.  x + (-45) = (-62 ) + 17

b.  x + 29 = /-43/ + (-43)

c.  43 + (9 - 21) = 317 - ( x +317)

d.  (15 - x ) + ( x - 12 ) = 7 - ( -5 + x )

e.  x - { 57 - [ 42 + ( -23 - x ) ] } = 13 - { 47 + [ 25 - ( 32 - x ) ] }

a. 32 x (650 + 349 + 1 ) 

= 32 x 1000

= 32 000

b. 45 x ( 1273 - 201 - 72)

= 45 x 1000

= 45 000

a. 650 x 32 + 349 x 32 + 32

= (650 + 349 + 1) x 32

= 1000 x 32

= 32000.

b. 1273 x 45 - 201 x 45 - 72 x 45

= (1273 - 201 - 72) x 45

= 1000 x 45 

= 45000.

a, (-4) . (+125) . (-25) . 6 . (-8)

  =[ (-4) . (-25) ] . [ (+125) . (-8) ] . 6

  =    100          .        (-1000)      . 6

  =              -100 000                  . 6

  =                     -600 000

b,  122 . (-12345) + 12345 . (-78)

   = 12345 . [ (-122) + (-78) ]

   = 12345 .        (-200)

   =      -2 469 000

c,  36 . (-9) + 9 . (-64)

  =  9 .  [ (-36) + (-64) ]

  =  9 .         (-100)

  =       -900