2x² - x = 0
x(2x - 1) = 0
x₁ = 0
2x₂ - 1 = 0
x₂ = 0,5
Ответ: 0 и 0,5
(6/7 - y) + 2/7 = 5/7
6/7 - y = 5/7 - 2/7
6/7 - y = 3/7
y = 6/7 - 3/7
y = 3/7
(6/7 - 3/7) + 2/7 = 5/7
5/7 = 5/7
{20 - (3а - 7)} /10 = 9/10
20 - (3а - 7) = 9/1 = 9
20 - (3а - 7) = 9
3а - 7 = 20 - 9
3а - 7 = 11
3а = 7 + 11
3а = 18
а = 18 : 3
а = 6
640см7см+100см98см80см9см=647см+287см=934см=9м3дм4см
200см19см95см+600см5см=314см+605см=919см=9м1дм9см