m-4/9m=45 84/108=2y-0,5 4,5

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m- $\frac{4}{9}m$ = 45 $\frac{9}{9}m$ - $\frac{4}{9}m$ =45 $\frac{5}{9}m$ = 45m=45: $\frac{5}{9}$ m= $\frac{45*9}{5}$ m= $\frac{9*9}{1}$ m=81 $\frac{84}{108} =2y- \frac{0,5}{4,5}$ $\frac{4*21}{4*27} =2y- \frac{0,5}{0,5*0,9}$ $\frac{21}{27} =2y- \frac{1}{9}$ 2y= $\frac{21}{27} + \frac{1}{9} = \frac{21}{27} + \frac{3*1}{3*9} = \frac{21}{27} + \frac{3}{27} = \frac{24}{27} = \frac{3*8}{3*9} = \frac{8}{9}$ 2y= $\frac{8}{9}$ y= $\frac{8}{9}$ :2у= $\frac{8}{9*2}$ у= $\frac{4}{9}$
- Автор:
  bentley38
- 5 лет назад
- 0
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