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Sagot :

1)

A= x^2 + 2 * x * 1/3 + (1/3)^2

A=x^2 + 2/3x + 1/9

B=(5-2x)^2

B=5^2 - 2 * 5 * 2x + (2x)^2

B=25 - 20x + 4x^2

2)

A=(x+3)^2

B=(4x-7)^2

C=(10x-1)(10x+1)

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