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Vũ Hà Vy Anh 17/05/2017 at 16:53real time travel of motobike is
9h 42 - 8h 30= 1h 12
or 1,2 h
the speed of motobike:
60:1,2=50(km/h)
answer :50 km/h
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Nguyễn Thị Thu Thủy 17/05/2017 at 20:29Time upon the road as:
9h42'-8h30'=1h12'
1h12'=1,2h
Motor of motor are :
60:1,2=50(km/h)
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Nguyễn Thanh Huyền 18/05/2017 at 20:21Motorcycle travel time is :
9 h 42' - 8 h 30' = 1 h 12'
Or : 1,2 h
The speed of motobike :
60 : 1,2 = 50 ( km/h )
Answer : 50 km/h
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I can't understand "d is the centroid of BC"
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The sum of a,b,c is: \(15.3=45\)
The sum of a,b is: \(18.2=36\)
So the value of c is: \(45-36=9\)
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Let (a ; b) be the intersection of the graphs of functions.
We have :\(\left\{{}\begin{matrix}b=2a^2+3a+4\\b=a-1\end{matrix}\right.\)\(\Rightarrow2a^2+3a+4=a-1\)
\(\Rightarrow2a^2+2a+5=0\)\(\Rightarrow\left[{}\begin{matrix}a=\dfrac{-2+\sqrt{2^2-4.2.5}}{4}=\dfrac{3i-1}{2}\\a=\dfrac{-2-\sqrt{2^2-4.2.5}}{4}=\dfrac{-3i-1}{2}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}b=\dfrac{3i-3}{2}\\b=\dfrac{-3i-3}{2}\end{matrix}\right.\)
So, the answer is \(\left(\dfrac{3i-1}{2};\dfrac{3i-3}{2}\right);\left(\dfrac{-3i-1}{2};\dfrac{-3i-3}{2}\right)\)
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FC Alan Walker 21/06/2018 at 02:05
Your title is wrong. Here's a example: \(abcd=1.\left(-1\right).1.\left(-1\right)=1\)but \(a^2+b^2+c^2+d^2+ab+cd=1+1+1+1+\left(-1\right)+\left(-1\right)=2< 6\)
Huy Toàn 8A (TL)
11/07/2018 at 00:26
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Your question is not clear, please check again!
Huy Toàn 8A (TL) selected this answer. -
Đinh Sáng Official 11/07/2018 at 07:41
\(\left(\dfrac{1}{2}x-3\right)=\dfrac{1}{2}-3=\dfrac{1}{2}-\dfrac{3}{1}=\dfrac{1}{2}-\dfrac{6}{2}=\dfrac{-5}{2}\)
