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2010-03-10T13:05:27+01:00
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