Odpowiedź:
a) 4/5*90=360/5=72
b) 2/20*55=1/10*55=55/10=5,5
c)2[tex]\frac{5}{8}[/tex]*144=21/8*144=21/8*12*12=21*3*6=378
d)4[tex]\frac{5}{8}[/tex]*(8+6)=4[tex]\frac{5}{8}[/tex]*14=(37/8)*14=(37/4)*7=259/4=64[tex]\frac{3}{4}[/tex]
[tex]a) \ \frac{4}{5} \ liczby \ 90 = \frac{4}{5}\cdot90 = 4\cdot18 = 72\\\\b) \ \frac{2}{20} \ liczby \ 55 = \frac{2}{20}\cdot55 = \frac{1}{10}\cdot55 = 5,5\\\\c) \ 2\frac{5}{8} \ liczby \ 144 = \frac{21}{8}\cdot144 = 21\cdot18=378\\\\d) \ 4\frac{5}{8} \ sumy \ liczb \ 8 \ i \ 6 = \frac{37}{8}\cdot(8+6) = \frac{37}{8}\cdot 14 =37\cdot\frac{7}{4} = \frac{259}{4} = 64,75[/tex]
