Xét \(a-b=2\left(a+b\right)\)
\(a-b=2a+2b\)
\(2a-a=-b-2b=-3b\)
Xét \(a-b=\frac{a}{b}\Rightarrow-3b-b=\frac{a}{b}\)
\(\Rightarrow-4b=\frac{a}{b}\)
Xét a - b = 2 ( a + b )
a - b = 2a + ab
2a - a = -b - 2b = -3b
Xét a - b = a/b => -3b - b = a/b
=>-4b = a/b