Question

2.17×99+0.217×10怎么简便运算

Answer 1

2.17×99+0.217×10=2.17×(100-1)+2.17=2.17×100-2.17+2.17=217

Answer 2

2.17×99+0.217×10=2.17×99+2.17×1=2.17×（99+1）=2.17×100=217

Answer 3

2.17*99+2.17*100
=2.17*（99+1）
=2.17*100
=217