Đáp án:
$1) x=\dfrac{2497}{39}\\
2)
x=26\\
3)
x=\dfrac{7}{2}$
Giải thích các bước giải:
$1) 78.(x-64)=2\\
\Leftrightarrow x-64=\dfrac{2}{78}=\dfrac{1}{39}\\
\Leftrightarrow x=64+\dfrac{1}{39}\\
\Leftrightarrow x=\dfrac{2496}{39}+\dfrac{1}{39}\\
\Leftrightarrow x=\dfrac{2497}{39}\\
2)
(134-x):36=3\\
\Leftrightarrow 134-x=3.36=108\\
\Leftrightarrow x=134-108=26\\
3)
134.(x-3)=35+160:5\\
\Leftrightarrow 134x-402=35+32=67\\
\Leftrightarrow 134x=67+402=469\\
\Leftrightarrow x=\dfrac{469}{134}=\dfrac{7}{2}$
