Odpowiedź:
) (2s-4t-1)(t-s)-(s-2t-3)(t+s)=
2st-2s²-4t²+4st-t+s-(st+s²-2t²-2st-3t-3s)=
2st-2s²-4t²+4st-t+s-st-s²+2t²+2st+3t+3s=
7st-3s²-2t²+2t+4s
b) (3m+1)(2m-1)(m-2)=
6m²-3m+3m²-6m+2m-1+m-2+2m²-4m-m+2=
11m²-11m-1
c) a-(a-1-b)(a+5)=
a-(a²-5a+a-5+ab-5b)=
7a-a²-5+ab-5b
d) x²y-(x-y²-1)(x²+2y-3)=
x²y-(x³+2xy-3x-x²y²-2y³+3y²-x²-2y+3)=
x²y-x³-2xy+3x+x²y²+2y³-3y²+x²+2y-3
Szczegółowe wyjaśnienie:
