4m²+4m≥-1
4m²+4m+1-1=(2m+1)²-1
(2m+1)²-1≥-1 /+1
(2m+1)²≥0 Bcegda pravilno.
584+583²-584²+583=584^(1-2)+583(2+1)=583³/584=198155284/584=339306 580/584= 339306 145/146
3x-2(x-5)≥-6 : 3x-2x+10≥-6 : x≥-16
<span>2cos x>1 cosx=1/2
cosx>1/2 x=+-(</span>π/3) +2πn, n∈Z
x∈(-(π/3) +2πn; (π/3) +2πn) или -(π/3) +2πn<x< (<span>π/3) +2πn
</span>отв: x∈(-(π/3) +2πn; (<span>π/3) +2πn), n</span>∈Z<span>
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