一道数学题(2²+4²+…+100²)—(1²+3²+…+99²)在线等
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一道数学题(2²+4²+…+100²)—(1²+3²+…+99²)在线等
一道数学题(2²+4²+…+100²)—(1²+3²+…+99²)在线等
一道数学题(2²+4²+…+100²)—(1²+3²+…+99²)在线等
(2²+4²+…+100²)—(1²+3²+…+99²)
=(2²-1²)+(4²-3²)+(6²-5²)+……+(100²-99²)
=(1+2)(2-1)+(3+4)(4-3)+(5+6)(6-5)+……+(99+100)(100-99)
=1+2+3+4+5+……+100
=(1+100)x100÷2
=5050
34
(2²+4²+…+100²)—(1²+3²+…+99²)
=(2²-1²)+(4²-3²)+(6²-5²)+……+(100²-99²)
=(1+2)(2-1)+(3+4)(4-3)+(5+6)(6-5)+……+(99+100)(100-99)
=1+2+3+4+5+……+100
=(1+100)x100÷2
=5050
=2*2-1*2+4*2-3*2......+100*2-99*2=3+7+11+。。。+199=?自己算吧,下面就简单了
(2²+4²+…+100²)—(1²+3²+…+99²)
=(2²-1²)+(4²-3²)+……+(100²-99²)
=(2+1)+(4+3)+……+(100+99)
=1+2+3+4+……+99+100
=(1+100)*100/2
=5050