problème pour réduire
a) 2( 5x² - 2 ) + 4 ( 3 - 2x² + x ) - 2 ( 2x + 4 )
b) - 4 ( 5x + 3 - 2x² ) - 3 ( x - 4 )
10 x^{2} - 4 +12 - 8 x^{2} + 4x -4x - 8
10 x^{2} - 8 x^{2} + 4x - 4x +12 - 4 - 8
2 x^{2} + 0 + 0
2 x^{2}
-20x -12 + 8 x^{2} - 3x + 12
8 x^{2} -20x -3x +12 -12
8 x^{2} -17x +0
8 x^{2} -17x
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10 x^{2} - 4 +12 - 8 x^{2} + 4x -4x - 8
10 x^{2} - 8 x^{2} + 4x - 4x +12 - 4 - 8
2 x^{2} + 0 + 0
2 x^{2}
-20x -12 + 8 x^{2} - 3x + 12
8 x^{2} -20x -3x +12 -12
8 x^{2} -17x +0
8 x^{2} -17x