Sagot :
Bonjour ;
3x² + (2 - 5x)(-x + 4x) + 2x + x³
= 3x² + (2 - 5x)(3x) + 2x + x³
= 3x² + 6x - 15x² + 2x + x³
= x³ - 12x² + 8x .
2x(6 - 5x)(-x + 3x) + 2x² + 5x³
=2x(6 - 5x)(2x) + 2x² + 5x³
= 4x²(6 - 5x) + 2x² + 5x³
= 24x² - 20x³ + 2x² + 5x³
= - 15x³ + 26x² .
Réponse :
3x²+(2-5x)(-x+4x)+2x+x^3
=3x²+(-2x+8x+5x-20x²)+2x+x^3
=3x²-2x+8x+5x-20x²+2x+x^3
=x^3-17x²+13x
2x(6-5x)(-x+3x)+2x²+5x^3
=2x(-6x+18x+5x²-15x²)+2x²+5x^3
=-12x²+36x²+10x^3-30x^3+2x²+5x^3
=-15x^3+26x²
