题目内容
(4+8+12+16+…+1000)-(5+10+15+20+…+1000)
(4+8+12+16+…+1000)-(5+10+15+20+…+1000),
=(4+1000)×(1000÷4)÷2-(5+1000)×(1000÷5)÷2,
=1004×250÷2-1005×200÷2,
=125500-100500,
=25000.
=(4+1000)×(1000÷4)÷2-(5+1000)×(1000÷5)÷2,
=1004×250÷2-1005×200÷2,
=125500-100500,
=25000.
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