Question

tìm x:

\(\frac{x}{30}+\frac{x}{40}=\frac{35}{4}\)

(câu hỏi đêm khuya -.-)

 

Answer 1

QĐMS :

X x 40/1200 + X x 30/1200 = 35 x 300/4 x 300 = 10500/1200

= X x 40 + X x 30/1200 = 10500/1200

= X x 70/1200 = 10500/1200

= X = 10500 : 70

= X = 150

Answer 2

\(x=150\)

Answer 3

\(\frac{x}{30}+\frac{x}{40}=\frac{35}{4}\)

\(\frac{4x}{120}+\frac{3x}{120}=\frac{1050}{120}\)

\(\Rightarrow4x+3x=1050\)

\(\Rightarrow7x=1050\)

\(\Rightarrow x=1050:7\)

\(\Rightarrow x=150\)

Answer 4

=> \(\frac{4x}{120}+\frac{3x}{120}=\frac{1050}{120}\) 

=> \(\frac{7x}{120}=\frac{1050}{120}\) 

=> 7x=1050 => x= 150

Answer 5

x=150 để x/30 + x/40=35/4