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Sagot :

A = 9x+y  
A = 9x+y

B = 9x*4x  
B = 36x²

C = y-11y  
C = -10y

D = 8x²-5x²  
D = 3x²

E = 3ab*4a  
E = 12a²b

F = 5xy-9yx
F = -4xy

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