5.1*0.3+5.2*0.3+…+5.8*0.3+5.9*+0.3
答案:2 悬赏:80 手机版
解决时间 2021-01-15 16:19
- 提问者网友：無理詩人
- 2021-01-15 10:24
5.1*0.3+5.2*0.3+…+5.8*0.3+5.9*+0.3
最佳答案
- 五星知识达人网友：轻雾山林
- 2021-01-15 11:04
5.1*0.3+5.2*0.3+…+5.8*0.3+5.9*+0.3
=0.3x(5.1+5.2+...+5.9)
=0.3x9x5.5
=14.85
=0.3x(5.1+5.2+...+5.9)
=0.3x9x5.5
=14.85
全部回答
- 1楼网友：忘川信使
- 2021-01-15 12:23
=0.3*(5.1+5.2+...+5.9)
=0.3*[(5.1+5.9)+(5.2+5.8)+(5.3+5.7)+(5.4+5.6)+5.5]
=0.3*(11*4+5.5)
=0.3*49.5
=0.3*(50-0.5)
=0.3*50-0.3*0.5
=15-0.15
=14.85追问1+14.25+27.25+27.25+40.25+.......+2003.25=？
=0.3*[(5.1+5.9)+(5.2+5.8)+(5.3+5.7)+(5.4+5.6)+5.5]
=0.3*(11*4+5.5)
=0.3*49.5
=0.3*(50-0.5)
=0.3*50-0.3*0.5
=15-0.15
=14.85追问1+14.25+27.25+27.25+40.25+.......+2003.25=？
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