5.1*0.3+5.2*0.3+…+5.8*0.3+5.9*+0.3
2个回答
展开全部
=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
=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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