(50+51+52.+99+100)-(1+2+3.+59+58)

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(50+51+52.+99+100)-(1+2+3.+59+58)

(50+51+52.+99+100)-(1+2+3.+59+58)
(50+51+52.+99+100)-(1+2+3.+59+58)

(50+51+52.+99+100)-(1+2+3.+59+58)
(50+100)×51÷2-(1+58)×58÷2
=3825-1711
=2114

高人

=(1+2……+49+60+61……+99+100)
=50*25+160*20+80
=4530