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a) 4(5*0,1+1)(1-5*0,1)-5[4*(-1)+1][1-4*(-1)]=
4(0,5+1)(1-0,5)-5(-4+1)(1+4)=
6 * 0,5 + 15 * 5 = 3 + 75 = 78
b) [(-1)-2*0,1]²+[2(-1)-0,1]²-5[(-1)-0,1][(-1)+0,1]=
[(-1)-0,2]²+[(-2)-0,1]²-5*(-1,1)(-0,9)=
(-1,2)²+(-2,1)²+5,5*(-0,9)=
1,44+4,41-4,95=5,85-4,95=0,9
c) 3*0,1[3*0,1 - 2(-1)]-[3-(-1)][(-1)+3]-[(-1)-3*0,1]²=
0,3(0,3+2)-4*2-[(-1)*0,3]=
0,3*2,3-8+0,3=0,69-8+0,3=(-7,01)
Zad2.
a) n-1 * n-2 = n²-2n-n+2=n²-3n+2 = n² + (-3n) + 2
b)2n+2 * 2n+4 = 4n²+8n+4n+8=4n²+12n+8
c)2n-3 * 2n-1 = 4n²-2n-6n+3=4n²-8n+3 = 4n² + (-8n) + 3