Question

Tìm x, bt:

a) 92×4-27= x+350/x +315

b)  ( 3/2 - x) ×1/3 -2/3× (1/2 - x) =1/3

~♥~♥~♥~

Answer 1

a) \(92.4-27=\frac{x+350}{x}+315\)

\(368-27=1+\frac{350}{x}+315\)

\(341=\frac{350}{x}+316\)

\(341-316=\frac{350}{x}\)

\(25=\frac{350}{x}\)

\(25x=350\)

\(x=14\)

b) \(\left(\frac{3}{2}-x\right).\frac{1}{3}-\frac{2}{3}.\left(\frac{1}{2}-x\right)=\frac{1}{3}\)

\(\frac{\frac{3}{2}}{3}-\frac{x}{3}-\frac{2}{3}.\left(\frac{1}{2}-x\right)=\frac{1}{3}\)

\(\frac{1}{2}-\frac{x}{2}-\frac{2}{3}.\left(\frac{1}{2}-x\right)=\frac{1}{3}\)

\(\frac{3}{2}-x-2.\left(\frac{1}{2}-x\right)=1\)

\(\frac{3}{2}-x-1+2x=1\)

\(\frac{1}{2}+x=1\)

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

\(x=\frac{1}{2}\)