1) $\begin{cases}a-b=26 \\ \frac{1}{2}a-\frac{1}{4}b=39 \end{cases}\Rightarrow \begin{cases}a=130 \\ b=104 \end{cases}\Rightarrow a+b=232){x+y=151x−2y=1\Rightarrow {x=101y=50$
1) $\begin{cases}x-y=26 \\ \frac{1}{2}x-\frac{1}{4}y=39 \end{cases}\Rightarrow \begin{cases}x=130 \\ y=104 \end{cases}\Rightarrow x+y=2342){x+y=151x−2y=1\Rightarrow {x=101y=50$