Question

2/10×x+3/10×x=2,5 x bằng mấy vậy 

Answer 1

\(\dfrac{2}{10}x+\dfrac{3}{10}x=2,5x\)

\(\dfrac{1}{2}x=2,5x\)

\(\dfrac{1}{2}x=\dfrac{5}{2}x\)

\(\dfrac{1}{2}x-\dfrac{5}{2}x=0\)

\(-2x=0\)

\(x=0\)

Answer 2

\(\dfrac{2}{10}x+\dfrac{3}{10}x=2,5x\\ \dfrac{1}{2}x=\dfrac{5}{2}x\\ \dfrac{1}{2}x-\dfrac{5}{2}x=0\\ -2x=0\\ x=0\)

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Answer 3

0,2 * x + 0,3 * x = 2,5

x* (0,2+0,3)= 2,5

x* 0,5= 2,5

x=2,5:0,5

x=5

(* là dấu nhân nha)