Question

Identify the incorrect statements.

$\left(7+8\right)+9=7+\left(8+9\right)$

Answer 1

By the associative property of addition: $\left(\mathrm{a}+\mathrm{b}\right)+\mathrm{c}=\mathrm{a}+\left(\mathrm{b}+\mathrm{c}\right)$ , we have

$\left(7+8\right)+9=15+9=24$

Similarly, $7+\left(8+9\right)=7+17=24$

$\Rightarrow \left(7+8\right)+9=7+\left(8+9\right)$

Hence, the given statement is correct.