Question

ma ajutați va rog dau coroana
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Answer 1

Răspuns:

a) aducem la acelasi numitor 8 , adica inmultim a doua fractie cu 2

$\frac{5+2*1}{8}$ * 12= $\frac{7}{8}$ *12= $\frac{7*12}{8} = \frac{7*3}{2} = \frac{21}{2}$

b) $\frac{4-3}{15}$ * 25= $\frac{1* 25}{3*5} = \frac{5*5}{3*5} =\frac{5}{3}$

c) $\frac{3*3-7}{12}$ * 9= $\frac{2*9}{2*6}$= $\frac{3*3}{2*3} = \frac{3}{2}$

d) $\frac{7+3}{15}$ * 3= $\frac{10* 3}{3*5} =\frac{5*2}{5} = 2$

e) $\frac{9-1}{21}$ * 14= $\frac{8 * 14}{21} = \frac{8*7*2}{3*7} = \frac{16}{3}$

f)$\frac{9-1}{9}$ *3= $\frac{8*3}{9} =\frac{8*3}{3*3} =\frac{8}{3}$