=7а^2в^6(-125а^3)=-875а^5в^6
$$$$$$$$$$$$$$$$$$$
A) =-2*3 a*a2*b3*b4=-6a3b7
<span>b) =-8a15b6</span>
Сложим эти уравнения и вынесем за скобку х+у+z:
(x+y+z)(x+y+y+z+z+x)=3+4+5
2(x+y+z)²=12
(x+y+z)²=6.
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