계산: (200+198+196+.+2) - (1+3+5+.+199)=_.

계산: (200+198+196+.+2) - (1+3+5+.+199)=_.

(200+198+196+.+2) - (1+3+5+.+199), =[ (2+200) × 100 ̊ 2 ] - [= (1+199) × 100 ᄋ 2 ] = [202 × 50 ] - [200 × 50 ] = (202 - 200) × 50, = 100. 고 답은 : 100.