2х + у = 4
х - у = -1
3х = 3
х = 1
2 • 1 + у = 4
у = 2
Ответ: (1; 2)
<span>1.
√121 = 11
√1,44 = 1,2
√</span>¹⁶<span>/</span>₂₂₅ = ⁴/₁₅<span>
√1 </span>²⁵<span>/</span>₁₄₄ = <span> </span>√¹⁶⁹/₁₄₄ = ¹³/₁₂ = 1 ¹/₁₂<span>
б)
(√3)</span>² = 3<span>
(-√13)</span>² = 13<span>
(√5)</span>⁴ = 5² = 25
<span>
в)
(3√5)</span>² = 3² * 5 = 9*5 = 45
<span>
-3(√-5)</span>² = - 3 * 5 = - 15
<span>
(-3√5)</span>⁴ = 3⁴ * 5 = 81 * 5 = 405
<span>
г)
√729 - √529 = 27 - 23 = 4
√1/9 * √0,36 = 1/3 * 0,6 = 0,2</span>
1) 4(x-6)+5x=123
4х-24+5х=123
4х+5х=123+24
9х=147
х=147/9
х=16,3
Ответ: х=16,3
2) 4(x-6)+5x= -123
4х-24+5х= -123
4х+5х= -123+24
9х= -99
х= -99/9
х= -11
Ответ: х= -11
A1=1^3+1=2
a2=2^3+1=9
a3=3^3+1=28
a4=4^3+1=61
a5=5^3+1=126
a6=6^3+1=217
a7=7^3+1=344