Zad. 1
[tex]\text{Sposob I: }1\frac14*350zl=\frac54*350zl=5*87.50zl=437.50zl\\\text{Sposob II: }1.25*350zl=437.50zl\\\text{Sposob III: }350zl+\frac14*350zl=350zl+87.50zl=437.50zl\\\text{Sposob IV: }\\100\%+25\%=125\%\\350zl - 100\%\\x - 125\%\\x=\frac{350zl*125\%}{100\%}=\frac{43750zl}{100}=437.50zl[/tex]
Zad. 2
[tex]\frac3{10}x=25zl /*10\\3x=250zl /:3\\x=83\frac1{3}zl=83.33zl[/tex]
Zad. 3
Sposob I:
Po roku:
[tex]1.04*2000zl=2080zl[/tex]
Po dwoch latach:
[tex]1.04*2080zl=2163.20zl[/tex]
Sposob II:
[tex](1.04)^2*2000zl=1.0816*2000zl=2163.20zl[/tex]
Zad. 4
Sposob I:
[tex]1500zl*1.2=1800zl[/tex]
[tex]1800zl*0.8=1440zl[/tex]
Sposob II.
[tex]1.2*0.8*1500zl=0.96*1500=1440zl[/tex]
Zad. 5
Sposob I:
[tex]0.2*80=16\\0.25*16=4[/tex]
Sposob II:
[tex]0.2*0.25*80=0.05*80=4[/tex]
