Question

ego
em
ką
تمہ
1 Oblicz sprytnym sposobem.
-3003-3
118
Czy już umiem?
/Oblicz.
34
4 5
a)
II Oblicz.
b) -5555-552
222
5,1
5
b) 15 12
b) 1.3 1/1
5
c)
2-369-
c)
1
248
7.7
9 11
c) 12/11/ plis tylko I II PROSZE DAM NAJ SZYBKO

Answer 1

Odpowiedź:

I.

a) [tex]\frac{3}{4}*\frac{4}{5}= \frac{3}{1}*\frac{1}{5}= \frac{3}{5}[/tex]

b) [tex]\frac{4}{15} *\frac{5}{12}= \frac{1}{3} *\frac{1}{3}= \frac{1}{9}[/tex]

c) [tex]\frac{7}{9} *\frac{7}{11}= \frac{7*7}{9*11} =\frac{49}{99}[/tex]

II.

a) [tex]\frac{5}{6} *1\frac{1}{5} =\frac{5}{6} *\frac{1*5+1}{5} =\frac{5}{6} *\frac{5+1}{5} =\frac{5}{6} *\frac{6}{5} =\frac{1}{1} *\frac{1}{1}=1[/tex]

b) [tex]1\frac{2}{3}*3\frac{4}{5}= \frac{1*3+2}{3}*\frac{3*5+4}{5}= \frac{3+2}{3}*\frac{15+4}{5}= \frac{5}{3}*\frac{19}{5}= \frac{1}{3}*\frac{19}{1}= \frac{19}{3}=\frac{3*6+1}{3}=6\frac{1}{3}[/tex]

c) [tex]1\frac{5}{7} *\frac{14}{15}=\frac{1*7+5}{7}*\frac{14}{15}=\frac{7+5}{7}*\frac{14}{15}=\frac{12}{7}*\frac{14}{15}=\frac{4}{1}*\frac{2}{5}=\frac{8}{5}=\frac{1*5+3}{5}=1\frac{3}{5}[/tex]