Question

1200-20×18的简便运算？

Answer 1

1200÷20=60，60一18=42，42X20=840

Answer 2

1200-20ⅹ18
=1200-300
=900

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