Question

81 упражнения 82 упражнение помогите пожалуйста!!

Answer 1

$3x + 4 = 3 \times 2 + 4 = 6 + 4 = 10$

$3x + 4 = 3 \times x + 4 = 4$

$3x + 4 = 3 \times 10 + 4 = 30 + 4 = 34$

$3x + 4 = 3 \times 15 + 4 = 45 + 4 = 49$

$20 - 2a = 20 - 2 \times 3 = 20 - 6 = 14$

$20 - 2a = 20 - 2 \times 5 = 20 - 10 = 10$

$20 - 2a = 20 - 2 \times 0 = 20$

$20 - 2a = 20 - 2 \times 10 = 20 - 20 = 0$