Question

3x-4=5 x=?
И
6 3/7:1 6/7=4.5x x=?

Answer 1

Объяснение:

1) 3х-4=5

3х=5+4

3х=9

х=3

2) 45/7 × 6/7 =4,5х

270/49=4,5х

4,5х=270/49

х=60/49

Answer 2

Ответ:

$3x - 4 = 5. \\ 3x = 5 + 4. \\ 3x = 9. \\ x = \frac{9}{3} = 3.$

Объяснение:

$6 \frac{3}{7} \div 1 \frac{6}{7} = 4.5x. \\ \frac{45}{7} \div \frac{13}{7} = \frac{9}{2} x. \\ \frac{45}{7} \times \frac{7}{13} = \frac{9}{2} x. \\ 45 \times \frac{1}{13} = \frac{9}{2} x. \\ \frac{45}{13} = \frac{9}{2} x. \\ \frac{9}{2} x = \frac{45}{13} . \\ x = \frac{45}{13} \div \frac{9}{2} . \\ x = \frac{45}{13} \times \frac{2}{9} . \\ x = \frac{5}{13} \times 2. \\ x = \frac{10}{13} .$