(1,3a-4) - (6+2,7a) = 1,3a -4-6-2,7a = -1,4a-10
Ответ: г)
Z^2 + 6z - 7 <span>≤ 0
D = 36 + 28 = 64
-6 + 8 -6 - 8
x1 = ------------- = 1 x2 = ---------------- = -7
2 2
+ - +
------------|-------------------|--------------->
-7 1
Ответ: [ -7 ; 1 ]
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