Question

用简便算法计算（15.2-9.9)-(4.3-2.54）

Answer 1

(15.2-9.9)-(4.3-2.54)

=(15.2-(10-0.1))-((4+0.3)-2.54)

=(15.2-10+0.1)-4-0.3+2.54

=5.3-0.3-4+2.54

=3.54