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Sagot :

Bonjour,

Développer:

(2x-7x²)(3x-9x³)= 6x²-21x³-18x^4+63x^5= 63x^5-18x^4-21x³+6x²

5yx²(4x+3y³-7xy²)= 20x³y+15x²y^4-35x³y³

(-3m+2)(7m²-5m+1)= -21m³+15m²-3m+14m²-10m+2= -21 m³+29m²-13 m+2

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