AMC10 2020 B
AMC10 2020 B · Q1
AMC10 2020 B · Q1. It mainly tests Fractions.
What is the value of $1 -(-2) -3 -(-4) -5 -(-6)$?
计算 $1 -(-2) -3 -(-4) -5 -(-6)$ 的值?
(A)
-20
-20
(B)
-3
-3
(C)
3
3
(D)
5
5
(E)
21
21
Answer
Correct choice: (D)
正确答案:(D)
Solution
Because subtracting a negative number is equivalent to adding its opposite, the value of this expression is $$1 + 2 - 3 + 4 - 5 + 6 = 13 - 8 = 5.$$
因为减去一个负数相当于加上它的相反数,这个表达式的值为 $$1 + 2 - 3 + 4 - 5 + 6 = 13 - 8 = 5.$$
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