计算(-2)+(+12)+(-22)+(+32)+(-42)+.+(-82)+(+92)
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![计算(-2)+(+12)+(-22)+(+32)+(-42)+.+(-82)+(+92)](/uploads/image/z/332987-59-7.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%88-2%EF%BC%89%2B%EF%BC%88%2B12%EF%BC%89%2B%EF%BC%88-22%EF%BC%89%2B%EF%BC%88%2B32%EF%BC%89%2B%EF%BC%88-42%EF%BC%89%2B.%2B%EF%BC%88-82%EF%BC%89%2B%EF%BC%88%2B92%EF%BC%89)
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计算(-2)+(+12)+(-22)+(+32)+(-42)+.+(-82)+(+92)
计算(-2)+(+12)+(-22)+(+32)+(-42)+.+(-82)+(+92)
计算(-2)+(+12)+(-22)+(+32)+(-42)+.+(-82)+(+92)
-2+12=10
-22+32=10
.
-82+92=10
(-2)+(+12)+(-22)+(+32)+(-42)+.+(-82)+(+92)
=10*5=50
原式
=(10)×10/2
=50
-2+12=-22+32=。。。=-82+92=10,所以上式=50