a) 54 + x - 65 + 3 = 12

    54 + x - 65 = 9

    54 + x = 74

    x = 74 - 54 

    x = 20

b) x - 45 + 65 = 59

    x - 45 = -6

    x = -6 + 45 

    x = 39

\(a,54+x-65+3=12\)

\(\Leftrightarrow54+x-\left(65-3\right)=12\)

\(\Leftrightarrow54+x-62=12\)

\(\Leftrightarrow54-x=12+62\)

\(\Leftrightarrow54-x=74\)

\(\Leftrightarrow x=54-74\)

\(\Leftrightarrow x=-20\)

\(b,x-45+65=59\)

\(\Leftrightarrow x-\left(45-65\right)=59\)

\(\Leftrightarrow x-\left(-20\right)\)

\(\Leftrightarrow x+20=59\)

\(\Leftrightarrow x=59-20\)

\(\Leftrightarrow x=39\)

a) 54 + x - 65 + 3 = 12

54 + x  -65 = 12 + 3 = 15

54 + x = 15 + 65 = 80

x = 80 - 54 

x =26

b) x - 45 + 65 = 59

x - 45 = 59 - 65 = -6

x = - 6 + 45

x = 39

hok tốt .

1. Tính:

a) 23 + 24 - ( 65 x 2 - 4 ) x 4 + 66 + 44 - ( 54 : 9 x 9 : 9 + 45 ) : 1 + 1 - 1 x ( 23 + 23 - 23 x 2 +1 ) = 51

b) 4444444444444444444444444444444444444444444444444444444444444444444 : 1

= 4444444444444444444444444444444444444444444444444444444444444444444

c) 3⁰ = 0

d) 1/1 = 1

e)

a) - 530

b) 44444444444444444444444444444444444444444444444444444444444444444444

c) 0

d) 1

e) Em là em

-530

444444444444444444444444444444444444444444444444444444444444444

0

1

...

`@` `\text {Ans}`

`\downarrow`

`A.`

`x-56 \times 24 = 286`

`x-1344 = 286`

`x=286 + 1344`

`x=1630`

`B.`

`65 \times 54 - x = 1026`

`3510 - x =1026`

`x=3510 - 1026`

`x=2484`

`C.`

`36 \times 84 \div x = 72`

`3024 \div x = 72`

`x=3024 \div 72`

`x=42`

`D.`

`x \div 47 = 326 - 277`

`x \div 47 = 49`

`x= 49 \times 47`

`x=2303`

A. \(x-56\times24=286\\ x-1344=286\\ x=286+1344\\ x=1630\)

B. \(65\times54-x=1026\\ 3510-x=1026\\ x=3510-1026\\ x=2484\)

C. \(36\times84\div x=72\\ 3024\div x=72\\ x-3024\div72\\ x=42\)

D. \(x\div47=326-277\\ x\div47=49\\ x=49\times47\\ x=2303\)

các bạn giúp mình nhé

65+54-45.7356652245.0+456

=65+54+456

=575

_ht_

65 + 54 - 45 x 7356652245 x 0 +456

=575

544392266130

1 + 1 = 2

5 x 3 = 15

7 x 4 = 28

65 + 45 = 110

9 x 54 = 486

1 + 1 = 2

5 x 3 = 15

7 x 4 = 28

65 + 45 = 110

9 x 54 = 486

1+1=2

5x3=15

7x4=28

65+45=110

9x54=486

bn nhé!

Chúc bn hok giỏi!

\(x^3-5x^2-9x+45=0\)

=>\(x^2\left(x-5\right)-9\left(x-5\right)=0\)

=>\(\left(x-5\right)\left(x^2-9\right)=0\)

=>\(\left(x-5\right)\left(x-3\right)\left(x+3\right)=0\)

=>\(\left[{}\begin{matrix}x-5=0\\x-3=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=3\\x=-3\end{matrix}\right.\)

`x^3 -5x^2 -9x+45=0`

`<=> (x^3 -5x^2 )-(9x-45)=0`

`<=> x^2 (x-5)- 9(x-5)=0`

`<=>(x-5)(x^2 -9)=0`

`<=>(x-5)(x-3)(x+3)=0`

\(\Leftrightarrow\left[{}\begin{matrix}x-5=0\\x-3=0\\x+3=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=5\\x=3\\x=-3\end{matrix}\right.\)

Bài 1: 

15 + 65 = 80 

43 + 67 = 110 

65 + 10 = 75 

Bài 2: 

20 < 45 ;  54 < 65 ; 51 < 54 

Bài 3: 

Người về sớm nhất là người về lúc 6 giờ

Bài 1:

15+65=80       43+67=110             65+10=75

Bài 2: 

20<45                   54<65                51<54

Bài 3:

Nhà em.

70

Lời giải chi tiết:

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