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Sagot :

Ex2:

a×b+a×c a×b-a×c -b+c+a

b×c×a b+c+a b-c+a

a-b×c -b-c+a a+b×c

Ex3:

a (3) × 1 =a (3)

(a"2")"3" = a"6"

5a+5a=10 à

5a-7a=-2a

(a"3")"4" = a"12"

5a × 2 =10a"2"

5a"4"× 4 =20a"4"

3a"4" + 3a"4" = 6a"4"

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