Question

九点九九乘二点二二加三点三三乘三点三四的简便运算

Answer 1

9.99×2.22+3.33×3.34
=3.33×3×2.22+3.33×3.34
=3.33×6.66+3.33×3.34
=3.33×(6.66+3.34)
=3.33×10
=33.3