Question

(1.1}+{-1.1} + {1.2}+{-1.2} +(1.3}+{-1.3} + ... + {2.5} + {-2.5} is ____​

Answer 1

The answer is 0.

(1.1}+{-1.1} + {1.2}+{-1.2} +(1.3}+{-1.3} + ... + {2.5} +{-2.5}

= (1.1-1.1) + (1.2-1.2) + (1.3-1.3) + (2.5-2.5)

= 0