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Sagot :

( 1 / 3 - 3 / 4 )*2 = ( - 5 / 12 ) *2
= 25 / 144

- ( x - 2 )*2 + 9x*2 = 9x*2 - (x-2)*2
= (3x -(x-2)) x (3x + (x-2))
= (3x - x +2) x (3x + x-2)
= (2x + 2) × ( 4x - 2)
= 2 (x + 1) × 2 (2x - 1)
= 2×2( ×+1) × (2×-1)
= 4 (x+1 ) x (2x-1)

Voilà

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