Question

1200-20×18的简便运算？

Answer 1

1200-20 × 18=20 × 60-20 × 18=20 × （60－18）=20 × 42=840

Answer 2

1200-20 × 18=20 × 60-20 × 18=20 × （60－18）=20 × 42=840

Answer 3

1200 - 20 × 18 = 20 × 60 - 20 × 18 = 20 × (60 - 18) = 20 × 42 = 840

Answer 4

1200-20 × 18=20 × 60-20 × 18=20 × （60－18）=20 × 42=840

Answer 5

1200-20 × 18=20 × 60-20 × 18=20 × （60－18）=20 × 42=840