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 mega

a).3(a+2b)-5(a+2b)-7+2(2a+2b) = -3a-6b-5a-10b-7+4a+4b = -4a-12b-7   -4·2-12·(-1)-7 = -8+12-7 = 4-7 = -3 b).-3(a+b)(2a-2b)-7a-3(a-2b)² = -3(2a²-2ab+2ab-2b²)-7a-3(a²-4ab+4b²) = = -6a²+6b²-7a-3a²+12ab-12b² = -9a²-6b²-7a+12ab   -9·2²-6·(-1)²-7·2+12·2·(-1) = -9·4-6·1-14-24 = -36-6-14-24 = -80 c).-4(3a-2b)-5b-2b(3+2a)-7ab = -12a+8b-5b-6b-4ab-7ab = -12a-11ab-3b      -12·2-11·2·(-1)-3·(-1) = -24+22+3 = -2+3 =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    -47·2²+59·2·(-1)-40·(-1)² = -47·4-118-40·1 = -188-118-40 = -306-40 = -346