Sagot :
(7)solution:
5(3m²)=15m²(-8mn)=120m³n
(8)solution:
3x²y(2x+3y²)
=6x²+3y³
(9)solution:
(2x+7)(x²+2x-2)
=X²+4x+5
(10)solution
(x²-2x-7)(2x²+x²+7)
=2x²-2x+2x⁴-49
#notwell-sure
(7)solution:
5(3m²)=15m²(-8mn)=120m³n
(8)solution:
3x²y(2x+3y²)
=6x²+3y³
(9)solution:
(2x+7)(x²+2x-2)
=X²+4x+5
(10)solution
(x²-2x-7)(2x²+x²+7)
=2x²-2x+2x⁴-49
#notwell-sure