у' = (-8x + 45)' = -8 +0 = -8
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Ответ 10, не в коем случае 20
21/2+35 3/3+37 6/3=38 1/3
(m-n)²-(n-3m)(n+3m)=m²-2mn+n²-(n²-9m²)=m²-2mn+n²-n²+9m²=10m²-2mn
2^2-24=0
4^2+61 = 64+16
3)24^2/5 = 3x 1/4
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85^ya chf
(24 - 9 )