1.A
2C
3C
4B
5C

\(-12x=48\)
\(x=4\)

\(\left\{{}\begin{matrix}x-5=0\\-2x+6=0\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x=5\\x=3\end{matrix}\right.\)

Chủ tịch nc Đức:)

chia hết cho 5:)
Số mình chọn là 5 và 6

\(2x\left(x-7\right)+3\left(x-7\right)=0\)
\(\left(2x+3\right)\left(x-7\right)=0\)
\(\left\{{}\begin{matrix}2x+3=0\\x-7=0\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x=-\dfrac{3}{2}\\x=7\end{matrix}\right.\)

\(4^2.2^3< 7^5+6^4\)

\(\dfrac{3}{2}=1,5\)
\(\dfrac{1}{2}=0,5\)
\(\dfrac{5}{4}=1,25\)

d.\(-\dfrac{15}{12}x+\dfrac{3}{7}=\dfrac{1}{4}x-\dfrac{1}{2}\)
\(-\dfrac{3}{2}x=-\dfrac{13}{14}\)
\(x=\dfrac{13}{21}\)

1B