早教吧 育儿知识 作业答案 考试题库 百科 知识分享

怎么简便就怎样算.2.5×3.2×12.518.5-3.21-4.794.8+3.72+4.2+16.28(8+0.8)×1.25.

题目详情




▼优质解答
答案和解析
(1)2.5×3.2×12.5
=2.5×(4×0.8)×12.5
=(2.5×4)×(0.8×12.5)
=10×10
=100;

(2)18.5-3.21-4.79
=18.5-(3.21+4.79)
=18.5-8
=10.5;

(3)4.8+3.72+4.2+16.28
=(4.8+4.2)+(3.72+16.28)
=9+20
=29;

(4)(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11.