Question

am nevoie pana la ora 15 va rog repede !;!! ​

Answer 1

Răspuns:

impartirea frctiilor ordinare nu se poate calcula, dar o putem schimba in inmultire

scriem primul termen inmultit cu al doilea termen rasturnat

$1) \frac{2}{3}:\frac{4}{9}=\frac{2}{3}•\frac{9}{4}$

am schimbat impartirea cu inmultire si am rasturnat a doua fractie

$= \frac{2•9}{3•3}=\frac{18}{12}$

inmultim termenii de sus intre ei, inmultim termenii de jos intre ei

$=\frac{9}{6}$

am simplificat=am impartit si sus si jos prin 2

$=\frac{3}{2}$

am simplificat prin 3

2)$\frac{15}{49}:\frac{5}{14}=\frac{15}{49}•\frac{14}{5}=\frac{3}{49}•\frac{14}{1}=\frac{3}{7}•2=\frac{6}{7}$

Am schimbat impartirea in inmultire (rasturnand a doua fractie), am simplificat prin 5 la 15 si 5, am simplificat prin 7 la 49 si 14, am inmultit numărătorii intre ei, numitorii intre ei...

3) $\frac{22}{75}:\frac{33}{50}=\frac{22}{75}•\frac{50}{33}=\frac{2}{75}•\frac{50}{3}=\frac{2}{3}•\frac{2}{3}=\frac{4}{9}$