跪求解答1³+2³+3³...+99³+100³
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/14 23:52:58
跪求解答1³+2³+3³...+99³+100³
公式:1³+2³+3³...+(n-1)³+n³=【n(n+1)/2】²
所以
1³+2³+3³...+99³+100³
=[100×101÷2]²
=5050²
=25502500
再问: -32有16/25÷(-8×4)+2.5²+(1/2+2/3-3/4-11/12)×24=?
再答: -32有16/25÷(-8×4)+2.5²+(1/2+2/3-3/4-11/12)×24 =(32+16/25)÷(32)+(5/2)²+(1/2×24+2/3×24-3/4×24-11/12×24) =1+1/50+25/4 +12+16-18-22 =1/50+6+1/4-11 =-5+2/100+25/100 =-5+27/100 =-4又73/100
所以
1³+2³+3³...+99³+100³
=[100×101÷2]²
=5050²
=25502500
再问: -32有16/25÷(-8×4)+2.5²+(1/2+2/3-3/4-11/12)×24=?
再答: -32有16/25÷(-8×4)+2.5²+(1/2+2/3-3/4-11/12)×24 =(32+16/25)÷(32)+(5/2)²+(1/2×24+2/3×24-3/4×24-11/12×24) =1+1/50+25/4 +12+16-18-22 =1/50+6+1/4-11 =-5+2/100+25/100 =-5+27/100 =-4又73/100
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