Mathematics for IGCSE & O level - The Four Operations (Section 1 - No. 39)
Which of the following calculations demonstrate the correct order of operations?
5 + 2 x 3 = 7 x 3 = 21
5 + 2 x 3 = 5 + 6 = 11
(5 + 2) x 3 = 7 x 3 = 21
(5 + 2) x 3 = 5 + 6 = 11
解释
Multiplication is handled before addition in the first case. Brackets are used correctly in the third.