Đáp án:
23 x 7 + 77 x 7
= (23 + 77) x 7
= 100 x 7
= 700
`23 × 7 + 77 × 7`
`= (23 + 77) × 7`
`= 100 × 7`
`= 700`
Choose the excessive word in the sentence below.