早教吧 育儿知识 作业答案 考试题库 百科 知识分享

199加19.9加1.99加0.199的简便计算的过程还有243.25加543.25加743.25加943.25

题目详情
199加19.9加1.99加0.199的简便计算的过程还有243.25加543.25加743.25加943.25
▼优质解答
答案和解析
199+19.9+1.99+0.199
=200+20+2+0.2-1.111
=222.2-1.111
=221.089
243.25+543.25+743.25+943.25
=240+540+740+940+3.25x4
=780+1680+14
=780+20-6+1680
=2480-6
=2476