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=(-1+2)+(-3+4)+(-5+6)+(-7+8)+...+(-99+100)
=(1)+(1)+(1)+(1)+...+(1)
=1x50
=50
keterangan:
bilangan dari 1 sd 100 = 100 bilangan
krn di pasang dua dua maka 100/2=50
krn itulah maka 1 x 50
− 100 − 99 − 98 − ... − 2 − 1 − 0 + 1 + 2 + 3 + ... + 97 + 98 + 99
=-100+(-99+99)+(-98+98)+(-97+97)+...+(-1+1)+0
=-100+(0)+(0)+(0)+...+(0)+0
=-100