早教吧作业答案频道 -->其他-->
计算:(12.345+23.451+34.512+45.123+51.234)÷(1+2+3+4+5)=.
题目详情
计算:(12.345+23.451+34.512+45.123+51.234)÷(1+2+3+4+5)=______.
▼优质解答
答案和解析
(12.345+23.451+34.512+45.123+51.234)÷(1+2+3+4+5)
=[(1×10+2×1+3×0.1+4×0.01+5×0.001)+(2×10+3×1+4×0.1+5×0.01+1×0.001)+(3×10+4×1+5×0.1+1×0.01+2×0.001)+(4×10+5×1+1×0.1+2×0.01+3×0.001)+(5×10+1×1+2×0.1+3×0.01+4×0.001)]÷(1+2+3+4+5)
=[(1+2+3+4+5)×10+(1+2+3+4+5)×1+(1+2+3+4+5)×0.1+(1+2+3+4+5)×0.01+(1+2+3+4+5)×0.001]÷(1+2+3+4+5)
=[(1+2+3+4+5)×(10+1+0.1+0.01+0.001)])÷(1+2+3+4+5)
=(1+2+3+4+5)×11.111÷(1+2+3+4+5)
=11.111
故答案为:11.111.
=[(1×10+2×1+3×0.1+4×0.01+5×0.001)+(2×10+3×1+4×0.1+5×0.01+1×0.001)+(3×10+4×1+5×0.1+1×0.01+2×0.001)+(4×10+5×1+1×0.1+2×0.01+3×0.001)+(5×10+1×1+2×0.1+3×0.01+4×0.001)]÷(1+2+3+4+5)
=[(1+2+3+4+5)×10+(1+2+3+4+5)×1+(1+2+3+4+5)×0.1+(1+2+3+4+5)×0.01+(1+2+3+4+5)×0.001]÷(1+2+3+4+5)
=[(1+2+3+4+5)×(10+1+0.1+0.01+0.001)])÷(1+2+3+4+5)
=(1+2+3+4+5)×11.111÷(1+2+3+4+5)
=11.111
故答案为:11.111.
看了 计算:(12.345+23....的网友还看了以下:
帮帮忙数学题(321/123+345/234+432/543)*(345/234+432/543+ 2020-04-07 …
5分45秒=[]A.345秒B.545秒C.75秒 2020-04-07 …
下列各组线段中,能够组成直角三角形的是().A.678B.567C.456D.345 2020-04-07 …
求123×345+234×456除以11的余数.(算式) 2020-06-14 …
123,45,789,345,234共同点 2020-06-14 …
5.已有定义intx;floaty;,且执行scanf("%3d%f",&x,&y);语句时,输入 2020-06-14 …
10.在下面的IP地址中属于C类地址的是。A.141.0.0.0B.10.10.1.2C.197. 2020-07-18 …
求234的67比534少多少,列式正确的是()A.234×67+534B.234×67-534C. 2020-07-19 …
此题怎样算?(321/123+234/345+432/543)*(345/234+432/543+ 2020-07-19 …
已知全集U={12345},集合A,若,{25},则B=A.{245}B.{235}C.{345} 2020-07-30 …