I. Rozwiąż
a) (2b-5)(3-2b)-(3b+2)(b-6)
b) (3x-2y)(2x-5y)+(3x-1y)(2x+8y)
a) (2b-5)(3-2b)-(3b+2)(b-6)=
= 6b-4b²-15+10b-(3b²-18b+2b-12)=
= 6b+10b-15-4b²-3b²+18b-2b+12=
= -7b²+32b-3
b) (3x-2y)(2x-5y)+(3x-1y)(2x+8y)=
= 6x²-15xy-4xy+10y²+6x²+24xy-2xy-8y²=
= 12x²+2y²+3xy
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a) (2b-5)(3-2b)-(3b+2)(b-6)=
= 6b-4b²-15+10b-(3b²-18b+2b-12)=
= 6b+10b-15-4b²-3b²+18b-2b+12=
= -7b²+32b-3
b) (3x-2y)(2x-5y)+(3x-1y)(2x+8y)=
= 6x²-15xy-4xy+10y²+6x²+24xy-2xy-8y²=
= 12x²+2y²+3xy