Câu hỏi:
40 lượt xemLời giải
Hướng dẫn giải:
a) \(\frac{{2x + 7}}{3} = \frac{3}{2}\)
\(2.\left( {2x + 7} \right) = 3.3\)
\(4x + 14 = 9\)
\(4x = - 5\)
\(x = - \frac{5}{4}\)
Vậy \(x = - \frac{5}{4}\).
b) \(\left( {4{x^4} - 3{x^3} + {x^2}} \right):\left( { - {x^2}} \right) + 4{\left( {x - 1} \right)^2} = 0\)
\(\left( {4{x^4}} \right):\left( { - {x^2}} \right) - \left( {3{x^3}} \right):\left( { - {x^2}} \right) + \left( {{x^2}} \right):\left( { - {x^2}} \right) + 4\left( {x - 1} \right)\left( {x - 1} \right) = 0\)
\( - 4{x^2} + 3x - 1 + 4\left( {{x^2} - x - x + 1} \right) = 0\)
\( - 4{x^2} + 3x - 1 + 4{x^2} - 8x + 4 = 0\)
\( - 5x + 3 = 0\)
\(x = \frac{3}{5}\)
Vậy \(x = \frac{3}{5}\).
