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Sagot :

Bonjour,

A1=(x)*(x)= x²

A2=(x+7)*(x+7)=x²+7²+2*x*7= x²+49+14x

A2-A1= 74 <=>

x²+49+14x-x²=74 <=>

49+14x=74 <=>

14x=25 <=>

x=25/14

A1=x²=(25/14)²cm²=(625/196)cm²

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