Question

0.42×160+36×1.6-31×3.2的简算方法

Answer 1

0.42×160+36×1.6-31×3.2

=0.42×160+18×3.2-31×3.2

=0.42×160-13×3.2

=42×1.6-13×3.2

=21×3.2-13×3.2

=8×3.2

=25.6