Question

5. Подбери подходящее 6.4 6x + 12:2 7.3=7 x - 14:2 . 88 значение буквы. - 5 a=52+5.3 a 8.5-8.3 8 =​

Answer 1

1)

$6 \times 4 = 6 \times x + 12 \div 2 \\ 24 = 6x + 6 \\ 6x = 24 - 6 \\ 6x = 18 \\ x = 18 \div 6 \\ x = 3$

или

$6 \times 4 = 6 \times x + 12 \div 2 \\ 6 \times 4= 6 \times x + 6 \\ 6 \times 4 = 6(x + 1) \\ x + 1 = 4 \\ x = 4 - 1 \\ x = 3$

2)

$7 \times 3 = 7 \times x - 14 \div 2 \\ 21 = 7x - 7 \\ 7x = 21 + 7 \\ 7x = 28 \\ x = 28 \div 7 \\ x = 4$

или

$7 \times 3 = 7 \times x - 14 \div 2 \\ 7 \times 3 = 7 \times x - 7 \\ 7 \times 3 = 7(x - 1) \\ 3 = x - 1 \\ x = 3 + 1 \\ x = 4$

3)

$5 \times a = 5 \times 2 + 5 \times 3 \\ 5a = 10 + 15 \\ 5a = 25 \\ a = 25 \div 5 \\ a = 5$

или

$5 \times a = 5 \times 2 + 5 \times 3 \\ 5 \times a = 5(2 + 3) \\ a = 2 + 3 \\ a = 5$

4)

$8 \times a = 8 \times 5 - 8 \times 3 \\ 8a = 40 - 24 \\ 8a = 16 \\ a = 16 \div 8 \\ a = 2$

или

$8 \times a = 8 \times 5 - 8 \times 3 \\ 8 \times a = 8(5 - 3) \\ a = 5 - 3 \\ a = 2$