Zadanie 2.
a) [tex]5x*7=35x[/tex]
b) [tex]\left(-\frac{3}{4}x\right):\frac{4}{3}=\left(-\frac{3}{4}x\right)*\frac{3}{4}=-\frac{9}{16}x[/tex]
c) [tex]8(3a-5)=24a-40[/tex]
d) [tex]-2(-5a+4b-1)=10a-8b+2[/tex]
e) [tex]6y*8=48y[/tex]
f) [tex]\left(-\frac{4}{5}y\right):\frac{5}{4}=\left(-\frac{4}{5}y\right)*\frac{4}{5}=-\frac{16}{25}y[/tex]
g) [tex]7(4a-5)=28a-35[/tex]
h) [tex]-3(-6a+7b-1)=18a-21b+3[/tex]
Zadanie 3.
a)
[tex]-2t+5+8t+3-7t+13=-t+21\\t=-1\\-t+21=-(-1)+21=1+21=22[/tex]
b)
[tex]2\frac{1}{2}x-9y+4x+3y-\frac{1}{2}x=6x-6y\\x=-2\ ,\ y= \frac{1}{3}\\6x-6y=6*(-2)-6*\frac{1}{3}=-12-2=-14[/tex]
c)
[tex]-7t+3+9t-1-3t+17=-t+19\\t=-1\\-t+19=-(-1)+19=1+19=20[/tex]
