Question

2.03+9.9×2.03简便运算是什么？

Answer 1

0.203+9.9×2.03
=2.03×(0.1+9.9)
=2.03×10
=20.3

Answer 2

2.03+9.9×2.03
=1×2.03+9.9×2.03
=2.03×（1+9.9）
=2.03×10.9
=2.03×（10+0.9）
=2.03×10+2.03×0.9
=20.3+2.03×（1-0.1）
=20.3+2.03-0.203
=22.127