(a)[1]
To make the calculation correct, place one pair of brackets: $3 + 5 \times 2 - 7 = 9$.
(b)[1]
Place $+$, $-$ and $\times$ into the spaces so that $3\ \ 5\ \ 2\ \ 7 = 20$ is correct.
Mathematics 4024 · O Level · The four operations
Mathematics 4024 · O Level · The four operations
To make the calculation correct, place one pair of brackets: $3 + 5 \times 2 - 7 = 9$.
Place $+$, $-$ and $\times$ into the spaces so that $3\ \ 5\ \ 2\ \ 7 = 20$ is correct.