Giải thích các bước giải:
\(\begin{array}{l}
B4:\\
a.52 - \left( {18 - 17} \right)\\
= 52 - 1 = 51\\
b.512.2 - 512.128 + 512.128 = 512.2 = 1024\\
c. - 37\left( {13 + 23 - 46} \right)\\
= - 37\left( {36 - 46} \right) = - 37.\left( { - 10} \right) = 370\\
d.121.\left( { - 8} \right).25.4\\
= 121.100.\left( { - 8} \right)\\
= 12100.\left( { - 8} \right) = - 96800\\
B5:\\
a.\left[ \begin{array}{l}
- 2x + 18 = 10\\
2x + 18 = 10
\end{array} \right. \to \left[ \begin{array}{l}
2x = 8\\
2x = - 8
\end{array} \right. \to \left[ \begin{array}{l}
x = 4\\
x = - 4
\end{array} \right.\\
b.3x + 26 = 5\\
\to 3x = - 21\\
\to = - 7\\
c.\left[ \begin{array}{l}
2\left( {x + 1} \right) = 10\\
2\left( {x + 1} \right) = - 10
\end{array} \right. \to \left[ \begin{array}{l}
2x = 8\\
2x = - 12
\end{array} \right.\\
\to \left[ \begin{array}{l}
x = 4\\
x = - 6
\end{array} \right.\\
d.144x = 56 + 130x\\
\to 14x = 56\\
\to x = 4
\end{array}\)
