Question

3x . 4 - 2x . 3 = 15

tìm x

Answer 1

\(3x\cdot4-2x\cdot3=15\)

\(12x-6x=15\)

\(6x=15\)

\(x=\frac{5}{2}\)

Answer 2

12x-6x=15

6x      =15

x       =15:6

x       =2,5

Vậy x=2,5

Answer 3

\(3x.4-2x.3=15\)

\(=>12x-6x=15\)

\(=>6x=15\)

\(=>x=\frac{5}{2}\)

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Answer 4

\(3x.4-2x.3=15\)

\(\Rightarrow3\left(4x-2x\right)=15\)

\(\Rightarrow3.2x=15\)

\(\Rightarrow2x=5\)

\(\Rightarrow x=\frac{5}{2}\)

Answer 5

3x.4-2x.3=15

3x.[4-2]=15

3x.2=15

x.6=15

x=2,5

Answer 6

\(3x.4x-2x.3=15\)

\(12x-6x=15\)

\(6x=15\)

\(x=\frac{15}{6}\)

\(x=\frac{5}{2}=2,5\)

Answer 7

(3x-2x).(4-3)=15

1x.1=15

x=15