Question

(1-2+3-4+5-6+....+9-10)+(+31)-(-5)2(la puterea a doua)

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Answer 1

[-1+(-1)+(-1)+(-1)+(-1)]+31-(-5)²=
(-1-1-1-1-1)+31-25=
-5+31-25=
26-25=
1

Answer 2

(1-2+3-4+5-6+....+9-10)+(+31)-(-5)²=
= -1+-1+-1+-1+-1 + 31 - 25
= -5 + 31 - 25 
= -30 + 31
= 1