Giúp em với ạ,em cảm ơn
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Những câu hỏi liên quan
21 tháng 5 2022
Câu 2:
a: \(=xy^5\cdot\dfrac{1}{4}x^6\cdot\left(-8\right)y^3z^3=-2x^7y^8z^3\)
b: \(f\left(1\right)=3\cdot1^2-4+1=0\)
=>x=1 là nghiệm của f(x)
\(f\left(-\dfrac{1}{3}\right)=3\cdot\dfrac{1}{9}-4\cdot\dfrac{-1}{3}+1=\dfrac{1}{3}+\dfrac{4}{3}+1=\dfrac{8}{3}\)
=>x=-1/3 không là nghiệm của f(x)
DT
Đỗ Thanh Hải
CTVVIP
12 tháng 10 2021
1 had gone away, I arrived at the party
2 reached the ground, the football match had ended
3 got to the airport, the plane had taken off
4 had done all the exercises, he went out with his friends
5 I arrived, Jack had left the office
6 he had done all his work, he went home
7 picked up their bags, they had eaten all the food
8 of 20, Madonna had become famous
9 I had heard the condition, I decided not to enter for the competition
10 Steven bought a new motorbike, he had saved enough money
1 A
2 A
3 A
4 A
12 tháng 3 2023
R=1/2CD=a
h=AD=2a
S1=Sxq=2*pi*r*h=2*pi*a*2a=4*pi*a^2
S2=Stp=2*pi*r^2+2*pi*r*h
=2*pi*a^2+2*pi*a*2a
=6*pi*a^2
>S1/S2=2/3
20 tháng 3 2023
Gọi hai số cần tìm lần lượt là a,a+1
Theo đề, ta co: a^2+(a+1)^2=85
=>2a^2+2a+1-85=0
=>a^2+a-42=0
=>a=6
mng giúp em với ạ.Em rất cảm ơn mọi người ạ
6 tháng 4 2022
a: AC=12cm
Xét ΔABC có AB<AC<BC
nên \(\widehat{C}< \widehat{B}< \widehat{A}\)
b: Xét ΔABC vuông tại A và ΔAEC vuông tại A có
AB=AE
AC chung
Do đó: ΔABC=ΔAEC
c: Xét ΔCEB có
CA là đường trung tuyến
BH là đường trung tuyến
CA cắt BH tại M
Do đó: M là trọng tâm của ΔCEB
R
0
SG
0
TH
1
1 was believed to be
2 might expect people to be less
3 quite impossible to imagine
4 to turn it into a profitable
5 changed his mind about asking
6 was bitterly disappointed by
7 took him ages to find
8 a pity you didn't
9 are ignorant of his decision
10 in addition to doing
11 only I had put aside
12 is under the weather
13 reached a peak
14 is always on time
15 in cash can you
16 had they fell asleep than
17 does he participate
18 has grown hugely
19 described the bank robbery in
20 accused Jack of having broken