Question

[Nghia Manh]

92.4 -27=(x+ 350) : x + 315

720: (41 - (2x +5) )=2^3.5

Bài 2

a) ( n+2) (n+5) chia hết cho 2

b) n(n+1) (n+2) chia hết cho 6

c) (n+1) (2n+1) chia hết cho 6

Answer 1

[Đức Hiếu]

Bài 1:

a, \(92.4-27=\left(x+350\right):x+315\)

\(\Rightarrow\left(x+350\right).\dfrac{1}{x}=92.4-27-315\)

\(\Rightarrow1+\dfrac{350}{x}=26\)

\(\Rightarrow350:x=25\Rightarrow x=14\)

b, \(720:\left[41-\left(2x+5\right)\right]=2^3.5\)

\(\Rightarrow720:\left(41-2x-5\right)=8.5\)

\(\Rightarrow720:\left(36-2x\right)=40\)

\(\Rightarrow36-2x=18\Rightarrow2x=18\Rightarrow x=9\)

Chúc bạn học tốt!!!

Answer 2

[Mashiro Shiina]

1)

a)

\(92.4-27=(x+350):x+315\)

\(368-27=(x+350):x+315\)

\(341=(x+350):x+315\)

\((x+350):x=341-315=26\)

\(26x=x+350\)

\(25x=350\)

\(x=14\)

b)

\(720:[41-(2x+5)]=2^3.5\)

\(720:[41-(2x+5)]=40\)

\(41-(2x+5)=18\)

\(2x+5=23\)

\(2x=18\)

\(x=9\)