Question

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Ex:1,2,3,4​

Answer 1

Explicație pas cu pas:

1.

$\frac{1}{5} ; \frac{2}{5} ; \frac{3}{5} ; \frac{4}{5}$

2.

$\frac{3}{2} = \frac{6}{4}$

$\frac{6}{3} = \frac{1}{2}$

$\frac{2}{2} = \frac{3}{3} = \frac{6}{6}$

$\frac{2}{4} = \frac{3}{6} = \frac{4}{18} = \frac{5}{10}$

3.

$\frac{9}{9} ;\frac{7}{9} ;\frac{6}{9} ;\frac{4}{9} ;\frac{3}{9} ;\frac{1}{9}$

4.

$a. \frac{3}{4} \: \: ;b. \frac{7}{9} \: \: ;c. \frac{8}{10}$

5.

$3 + a < 8 \\ a < 8 - 3 \\ a < 5$

$b - 3 < 5 \\ b < 5 + 3 \\ b < 8$

$c + c < 7 \\ c = 1;c = 2;c = 3$

6.

$\frac{a}{3} = \frac{b}{7} = 9 \\ \frac{a}{3} = 9 = > a = 9 \times 3 = > a = 27\\ \frac{b}{7} = 9 = > b = 9 \times 7 = > b = 63 \\ a + b = 27 + 63 = 90$

sau

$\frac{a}{3} = \frac{b}{7} = \frac{9}{1} = \frac{a + b + 9}{3 + 7 + 1} = \frac{a + b + 9}{11} \\ \frac{a + b + 9}{11} = 9 \\ a + b + 9 = 9 \times 11 \\ a + b + 9 = 99 \\ a + b = 99 - 9 \\a + b = 90$