Odpowiedź :
a)2(x-y)*(x+y)-3(x-2y)*2=2(x²-y²)-3(2x-4y)=2x²-2y²-6x+12y
b)=5(3ts-s²+9t²-3ts)-2(2s+4t)=15ts-5s²+45t²-15ts-4s-8t=-5s²+45t²-4s-8t
c)=(10-4x)+(x²-5)-5(2x+4)=10-4x+x²-5-10x-20=x²-14x-10
b)=5(3ts-s²+9t²-3ts)-2(2s+4t)=15ts-5s²+45t²-15ts-4s-8t=-5s²+45t²-4s-8t
c)=(10-4x)+(x²-5)-5(2x+4)=10-4x+x²-5-10x-20=x²-14x-10