Proszę pomóżcie!!! ;** Jak chcecie powiększyć obraz to Ctrl i +

Zad 1. a) Ob.=13a-7b+3a-b+3a+2a+2b+3a=24a-6b Ob.=24*2-6*0,5=48-3=45 b) Ob.=8*(3b-a)+4*2a=24b-8a+8a=24b Ob.=24*0,5=12 c) Ob.=a-b+2*3b+2b+2*(2a-b)=a-b+6b+2b+4a-2b=5a+5b Ob.=5*2+5*0,5=10+2,5=12,5 Zad2 a)3x+18z+8x-2y+13y-7z=11x+11y+11z b)m2+7m2-18n2+5m2n2+18n2=8m2+5m2n2 c)5a*b2-8a-4ab2a+2a+2bab=5ab2-8a-8a2b+2a+2ab2=7ab2-6a-8a2b d)1/2ax-3/4a2+3 3/4ax-1 1/2a2+5/8a2=2/4ax-6/8a2+15/4ax-12/8a2+5/8a2=17/4ax-15/8a2= 4 1/4ax-1 7/8a2 zad 3. a) (2a+b+ab)+(2b-8ab)-(4b-2a-4ab)=2a+b+ab+2b-8ab-4b+2a+4ab=4a-b-3ab b) (n-7)-(2m+3n-4)-(-4m-5n-0,75)=n-7-2m-3n+4+4m+5n+0,75=3n+2m-2,25 c) 7k-(m-4n+4)-(4k-3+n)+(2k-1)=7k-m+4n-4-4k+3-n+2k-1=5k-m+3n-2 d) (2a2-4ab+b2)-(a2-2ab-3b2)+(8ab-6b2)=2a2-4ab+b2-a2+2ab+3b2+8ab-6b2=a2+10ab-2b2