Răspuns:
Explicație pas cu pas:
a micsora inseamna a scadea si a marii inseamna a aduna
x% [tex]\displaystyle =\frac{x}{100}[/tex]
a) Micsorati suma de 180 lei cu 15%
[tex]\displaystyle 180-\frac{15}{100} \times 180^{(10}=180-\frac{15}{10} \times 18^{(2}=180-\frac{15}{5} ^{(5}\times 9= 180-3\times 9=180-27=153[/tex]
b)Micsorati suma de 240 lei cu 20%
[tex]\displaystyle 240-\frac{20}{100} \times 240^{(20}=240-\frac{1}{5} \times 240^{(5}=240-48=192[/tex]
c)Mariti suma de 2100 lei cu 25%
[tex]\displaystyle 2100-\frac{25}{100}^{(25} \times 2100=2100-\frac{1}{4} \times 2100^{(4}=2100-525=1575[/tex]
d)Mariti suma de 1480 lei cu 30%
[tex]\displaystyle 1480-\frac{30}{100} \times 1480^{(20}=1480-\frac{30}{5}^{(5} \times 74=1480-6\times 74=1480-444=1036[/tex]
