Question

a+b=
a×b=
40+(30+70) =
a+0 =
b+0=
(a+b) +c =
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Answer 1

Answer:

a+b=b+a

a×b=ab

40+(30+70)=140

a+0=a

b+0=b

(a+b)+c=c+(b+a)

Answer 2

1) A spuar + b spuar +2AB

3) 40+(100) = 40-100= -60