(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100) 这题怎么算,
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![(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100) 这题怎么算,](/uploads/image/z/176196-12-6.jpg?t=%28-1%29%2B%28%2B2%29%2B%28-3%29%2B%28%2B4%29%2B...%2B%28-99%29%2B%28%2B100%29+%E8%BF%99%E9%A2%98%E6%80%8E%E4%B9%88%E7%AE%97%2C)
(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100) 这题怎么算,
(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100) 这题怎么算,
(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100) 这题怎么算,
用-1减-99再加100
等于1
(-1)+(2)=1,(-3)+(4)=1,(-5)+(6)=1.。所以可知,(-n)+(n+1)=1(n=1,3,5……)。所以n一共有50个,答案为50*1=50
-1-99+2+98……+100=150
<-1+2>×50=50
一(1+99)X50÷2+(2十100)X50÷2
正负为一个组合等于1 ,共有50个组合,答案50
连这种题都不会还学什么啊,
.(_1)+(-99)与(+2)+(+98)相消,以此类推