Tìm \(x\) biết \(3,4.x+\left(-1,6\right).x+2,9=-4,9\)?
\(-4,\left(3\right).\)\(4,\left(3\right).\)\(-4,\left(2\right).\)\(4,\left(2\right).\)Hướng dẫn giải:\(3,4.x+\left(-1,6\right).x+2,9=-4,9\)
\(\left(3,4-1,6\right).x--4,9-2,9\)
\(1,8.x=-7,8\)
\(x=\dfrac{-7,8}{1,8}\)
\(x=-4,\left(3\right).\)