18у³-6у²+20у-19=18у³-(6у²-20у+19)
4х - y = 7
8x - 2y = 14
3x + 2y = - 3
8x + 3x - 2y + 2y = 14 - 3
11x = 11
x = 1
4 - y = 7
y = - 3
Ответ ( 1 ; - 3 )
Х-10 / х-9= 10/11
11(х-10)=10(х-9)
11х-110=10х-90
11х-10х=-90+110
х=20
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1/3a - 1/2t = 1
6a - 10t = 9
Решение способом сложения
- 6a + 9t = - 18
- t = - 9
t = 9
6a = 9 + 90
a = 99 : 6
a = 16,5