Question

Tìm x biết 

A. x = 11
B. x = 3
C. x = 5
D. x = 7

Answer 1

Chọn B

Answer 2

b

Answer 3

B

Answer 4

B

Answer 5

\(\dfrac{5+x}{9}=\dfrac{16}{18}\\ \left(5+x\right)\times18=9\times16=144\\ 5+x=144:18\\ 5+x=8\\ x=8-5\\ x=3\)

Answer 6

\(\Leftrightarrow18\left(5+x\right)=144\)

\(\Leftrightarrow90+18x=144\)

\(\Leftrightarrow18x=54\)

\(\Leftrightarrow x=3\)

Vậy chọn đáp án B.

Answer 7

B