13.
a/ x.(x2-5x+2) = x3-5x2+2x
b/ (x-1).(x+2) = x2+2x-1x+2 = x2+1x+2
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13.
a/ x.(x2-5x+2) = x3-5x2+2x
b/ (x-1).(x+2) = x2+2x-1x+2 = x2+1x+2