Opuść nawiasy, zredaguj wyrazy podobne i oblicz wartość liczbowa wyrażeń dla: a= 2 b= -1 a) -3 (a+2b)-5 (a+2b)-7+2 (2a+2b)= b)-3 (a+b)*(2a-2b)-7a-3(a-2b) do kwadratu. c)-4 (3a-2b)-5b-2b(3+2a)-7ab= d) -10(2a-2b) do kwadratu -7a (a+2b)-7ab= Daje NAJ

a) -3(a+2b)-5(a+2b)-7+2(2a+2b) = -3a-6b-5a-10b-7+4a+4b = -4a-12b-7 = -3 b)-3(a+b)*(2a-2b)-7a-3(a-2b)² = (-3a-3b)*(2a-2b)-7a-3(a²-4ab+4b²) =  =-6a²+6ab-6ba+6b²-7a-3a²+12ab-12b² = -9a²-6b²+12ab-7a = -80 c)-4(3a-2b)-5b-2b(3+2a)-7ab = -12a+8b-5b-6b-4ab-7ab = -12a-11ab-3b = 1 d)-10(2a-2b)² -7a(a+2b)-7ab =-10(4a²-8ab+4b²)-7a²-14ab-7ab = =-40a²+80ab-40b²-7a²-14ab-7ab = -47a²+59ab-40b² = -346