https://olm.vn/hoi-dap/question/783933.html

\(73\times28+x\times73=7300\)
\(73\times\left(28+x\right)=7300\)
\(28+x=7300:73\)
\(28+x=100\)
\(x=100-28\)
\(x=72\)

cứu tôi

= 7300 - 73 * 28

= 5256

 = 5256 :73

= 72

14,65*73+14,65*28-14,65

=14,65*73+14,65*28-14,65*1

=14,65*(73+28-1)

=14,65*100

=1465

14,65*73+14,65*28-14,65 = 14,65(73+28-1)

=14,65*100

=1465

\(10,\Rightarrow x-14=-8\Rightarrow x=6\\ 11,\Rightarrow7-x-32=-25\\ \Rightarrow-25-x=-25\Rightarrow x=0\\ 12,\Rightarrow3x-16=\dfrac{2\cdot7^4}{7^3}=2\cdot7=14\\ \Rightarrow3x=30\Rightarrow x=10\\ 13,\Rightarrow\left[{}\begin{matrix}x-4=5\\x-4=-5\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=9\\x=-1\end{matrix}\right.\\ 14,\Rightarrow\left(2x+11\right)^2=2^4:2^4=1\\ \Rightarrow\left[{}\begin{matrix}2x+11=1\\2x+11=-1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-5\\x=-6\end{matrix}\right.\\ 15,\Rightarrow7^{3x-2}=7^3\cdot4+7^3\cdot3=7^3\cdot7=7^4\\ \Rightarrow3x-2=4\\ \Rightarrow3x=6\Rightarrow x=2\)

10) x - [42 + (-28)] = -8

x - 14 = -8

x = -8 + 14 = 6

11) (7-x) - (25 +7) = -25

(7 -x) - 32 = -25

7 -x = -25 + 32 = 7

x = 7 -7 = 0

12) (3x - 2⁴) . 7³ = 2 . 7⁴

(3x - 16) . 343 = 4802

3x - 16 = 4802 : 343= 14

3x = 14 + 16 = 30

x = 30 : 3 =10

13) (x - 4)² = 25

⇒ 5² = 25

⇒ x - 4 = 5

⇒ x = 5 + 4 =9

14) 2⁴(2x + 11)² = 4²

16(2x + 11)² = 16

(2x + 11)² = 16 : 16 = 1

⇒ 2x + 11 = 1

⇒ 2x = 11 + 1 = 12

⇒ x = 12 : 2 = 6

15) 7^3x-2 - 3.7³ = 7³ . 4

7^3x-2 - 1029 = 1372

7^3x-2 = 1372 + 1029 = 2401

⇒ 7⁴ = 2401

⇒ 3x - 2 = 4

⇒ 3x = 4 + 2 = 6

⇒ x = 6 : 3 =2

a 24

b -3

c 161

d -1 

đúng ko bn

kb

B1

a) 28-{-13-[-11+(-12+5)]}=28-{-13-[-11+(-7)]}=28-{-13-[-18]}=28-5=23

b)-39-{-46+[-11-(-21)]}=-39-{-46+10}=-39-(-36)=-3

c)73+{-49-[-73-(72-8)]}=73+{-49-[-73-64]}=73+{-49-[-137]}=73+88=161

d)-86-{-97+[-11-(-28+5)]}=-86-{-97+[-11-(-23)]}=-86-{-97+12}=-86-{-85}=-1

73.25+28.25-25=25(73+28-1)=25.100=2500

=2500

k mình nha

\([(6\cdot x-73):2-84]\cdot28=5628\\(6x-73):2-84=5628:28\\(6x-73):2-84=201\\(6x-73):2=201+84\\(6x-73):2=285\\6x-73=285\cdot2\\6x-73=570\\6x=570+73\\6x=643\\x=643:6\\x=\dfrac{643}{6}\\Vậy:x=\dfrac{643}{6}\)

\(\left[\left(6x-73\right):2-84\right]\cdot28=5628\)

\(\left(6x-73\right):2-84=201\)

\(\left(6x-73\right):2=285\)

\(6x-73=570\)

\(6x=643\)

\(x=\dfrac{643}{6}\)

56−x=28

x=56−28

x=28

x−17=73

x=73 + 17

x=90