=(1×2+2×3+···+49×50)/5
=(1平方+2平方+···+49平方+50)/5
=49×(49+1)×(49×2+1)/(5×6)+50/5
=8095
1*2/5+2*3/5+3*4/5+……+48*49/5+49*50/5
2个回答
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