Question

Tìm x, biết:

a.(50-6.x).18= 2^3.3^2.5

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

Dấu . là nhân, ^ là mũ ạ!

Giúp mình vs! Tks

Answer 1

\(a)\)\(\left(50-6.x\right).18=2^3.3^2.5\)

\(\Leftrightarrow\)\(\left(50-6.x\right).18=8.9.5\)

\(\Leftrightarrow\)\(\left(50-6.x\right).18=360\)

\(\Leftrightarrow\)\(\left(50-6.x\right)=360\div18\)

\(\Leftrightarrow\)\(50-6.x=20\)

\(\Leftrightarrow\)\(6.x=50-20\)

\(\Leftrightarrow\)\(6.x=30\)

\(\Leftrightarrow\)\(x=5\)

\(b)\)\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=7450\)

\(\Leftrightarrow\)\(100x+\left(1+2+3+...+100\right)=7450\)

\(\Leftrightarrow\)\(100x+5050=7450\)

\(\Leftrightarrow\)\(100x=7450-5050\)

\(\Leftrightarrow\)\(100x=2400\)

\(\Leftrightarrow\)\(x=24\)

Answer 2

b.

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

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

=>100x + (100+1).50=7450

=>100x=2400

=>x=24

Answer 3

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

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

=> 100x + 5050=7450

=> 100x =7450-5050

=> 100x = 2400

=> x= 24

Answer 4

TL :

x = 5

_HT_

sai thì mong bn thông cảm.

Answer 5

(50−6x).18=23.32.5(50−6x).18=23.32.5

⇒ (50−6x).18=8.9.5(50−6x).18=8.9.5

⇒ (50−6x).18=360(50−6x).18=360

⇒ 50−6x=2050−6x=20

⇒ 6x=50−206x=50−20

⇒ 6x=306x=30

⇒ x=5x=5

Vậy x=5

Answer 6

Đáp án là x=5!

#TEAM.Lục Đại Khuyển Vương.I'm Nhị

Answer 7

^

(50−6x).18=23.32.5(50−6x).18=23.32.5

⇒ (50−6x).18=8.9.5(50−6x).18=8.9.5

⇒ (50−6x).18=360(50−6x).18=360

⇒ 50−6x=2050−6x=20

⇒ 6x=50−206x=50−20

⇒ 6x=306x=30

⇒ x=5x=5

Vậy x=5

Answer 8

TL

x=5

Hok tốt

#Krito