Giúp mình câu 44
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\(g'\left(x\right)=\left(-2x\right)'\cdot f'\left(-2x\right)\)
\(=-2\cdot f'\left(-2x\right)\)
\(=-2\left(-2x^2-4x\right)\)
\(=4x^2+8x\)
\(g''\left(x\right)=4\cdot2x+8=8x+8\)
g'(x)=0
=>4x(x+2)=0
=>x=0 hoặc x=-2
Khi x=0 thì \(g''\left(x\right)=8\cdot0+8=8\)>0
=>Khi x=0 thì g(x) đạt giá trị cực đại
Khi x=-2 thì \(g''\left(x\right)=8\cdot\left(-2\right)+8=-8< 0\)
=>Khi x=-2 thì g(x) không đạt giá trị cực đại
Vậy: G(x) đạt giá trị cực đại tại x=0
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46 If I had known Geogre wanted to get up early, I would have waken him
47 If Jim hadn't lent me the money, I wouldn't have been able to buy the motorbike
48 If she hadn't been wearing the seat belt, she wouldn't have injured (câu này sao ta)
49 If she had had enough money on her, she would have bought the coat
50 If....(tên ai đó) hadn't gone to the bus stop in time, she would have late for the interview
51 If.......hadn't recommened the hotel to us, we wouldn't have stayed at this hotel
52 If you had had breakfast, you wouldn't be hungry now
a.chia cho 15 dư 1
b. chia cho 15 dư 14
c.chia hết cho 81
k mình nha
chia 15 dư 1
chia cho 15 dư 14
chia hết cho 81
tích mk đi dù chỉ 1 cái
<=> 18 - 3 + x - 44 + x =55
<=> x + x = 55 - 18 + 3 + 44
<=> 2x = 84
<=> x = 84 : 2
<=> x = 42
Trả lời :.....................................................
18 + ( -3 + x ) - ( 44 - x ) = 55
\(\Leftrightarrow x+x=55-18+3+44\)
\(\Leftrightarrow2x=84\)
\(\Leftrightarrow x=84:2\)
\(\Leftrightarrow x=42\)