Question

Bài 3 : tìm x

A. 

7 + x trên 12 = 2/3

25 - x trên 18 = 1/2

Answer 1

\(\frac{7+x}{12}=\frac{2}{3}\)

\(=>\left(7+x\right).3=2.12\)

\(=>21+3x=24\)

\(=>3x=3\)

\(=>x=1\)

vay \(x=1\)

\(\frac{25-x}{18}=\frac{1}{2}\)

\(=>\left(25-x\right).2=18\)

\(=>50-2x=18\)

\(=>-2x=32\)

\(=>x=-16\)

vay \(x=-16\)

Answer 2

7+x / 12 = 2 / 3

7 + x = 8

x = 1

25 - x / 18 = 1 /2

25 - x = 9

x = 16

Answer 3

\(\frac{7+x}{12}=\frac{2}{3}\)

\(=>21+3x=24\)

\(=>x=1\)

\(\frac{25-x}{18}=\frac{1}{2}\)

\(=>50-2x=18\)

\(=>-2x=50-18\)

\(=>-2x=32\)

\(=>x=-16\)

Answer 4

7+x/12=2/3

x/12=2/3-7

x/12=-19/3

=>X.3=-19.12

=>X.3=-228

=>X=-228:3

=>X=-76

Vậy x=-76

25-x/18=1/2

x/18=25-1/2

x/18=49/2

=>x.2=49.18

=>x.2=882

=>x=882:2

=>x=441

Vậy x=411

Answer 5

x = 1

x = -16