tìm x a, x.( x + y ) = 2 b, 5x - 3x - x = 20 c, 8x - 4x = 1208
2 câu trả lời
$a)x.( x + y ) = 2$
$⇔x+y=2x$
Mà $x+y=2x$
Thì $y=1$
$⇒x.(x+1)=2$
$⇒x=1$
$b) 5𝑥−3𝑥−𝑥=20$
$1𝑥=20$
$𝑥=20$
$c) 8𝑥−4𝑥=1208$
$4𝑥=1208$
$\frac{4x}{4}=\frac{1208}{4}$
$𝑥=302$