问题 解答题

(1)1.222×9-1.332×4;

(2)8002-1600×798+7982

答案

(1)1.222×9-1.332×4(1.22×3)2-(1.33×2)2=3.662-2.662=(3.66+2.66)(3.66-2.66)=6.32;

(2)8002-1600×798+7982=8002-2×798×800+798=(800-798)2=22=4.

问答题 简答题
单项选择题