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Sagot :

bonsoir

A=(x+10)²
A=(x)²+2 * x * 10+10²
A=x²+20x+100

B=(5-2x)²
B=5² -2 * 5 * 2x+(2x)²
B=25-20x+4x²

C=(x+1)(x-1)
C=x²-1


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