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17 tháng 1 2017

3x = 2x

3x2 - 2x3 =0

x2 (3 - 2x) =0

=> x = 0 hoặc x = 1,5

mà điều kiện bài là x khác 0 nên x = 1,5

17 tháng 1 2017

3x2 = 2x3 trước nha

21 tháng 12 2016

1,5 nhé                                         

GIÚP MIK GIẢI BÀI NÀY NHA MẤY BẠN!! ^.^ ^-^1. Her success went beyond her expectation.Never .....................2. Tony is very charming, but I wouldn’nt trust him.Charming .....................3. I left without dsaying goodbye as I didn’t want to disturb the meeting.Rather than .....................4. If there is an emergency, ring this number.In case .....................5. The thieft must have come in through the window.The thieft almost .....................6. Driving at that...
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GIÚP MIK GIẢI BÀI NÀY NHA MẤY BẠN!! ^.^ ^-^

1. Her success went beyond her expectation.

Never .....................

2. Tony is very charming, but I wouldn’nt trust him.

Charming .....................

3. I left without dsaying goodbye as I didn’t want to disturb the meeting.

Rather than .....................

4. If there is an emergency, ring this number.

In case .....................

5. The thieft must have come in through the window.

The thieft almost .....................

6. Driving at that spees is dangerous although you are an experienced driver or not.

However .....................

7. Its lack of irregular verbs makes Esperanto to a unique language.

Unlike .....................

8. You won’t find a more dedicated worker anywhere than Mrs . Jones.

Nowhere .....................

9. The play is so popular that the theatre is likely to be full every night.

Such is .....................

10. Experts think that all dogs evolved from wolves.

All dogs .....................

0
12 tháng 10 2018

32/3 nha ban

3 tháng 2 2017

bài 1 là 3

3 tháng 2 2017

làm như thế nào vậy ạ

19 tháng 3 2017

?????????????????????????????????????????????? Are you learning English or Math? I'm sure you are're mistake of English

19 tháng 3 2017

:v

Bài thi số 3 19:25 Câu 1: A man drove a car from A to B at speed 60km/h. After arriving B, he took a rest for 30 minutes then turned back to A at speed 40km/h. Known that he started from A at 7:00 am and he reached A again at 3:15pm on the same day. The distance between A and B is km. Câu 2: The minimum of the expression is Câu 3: Given that is a positive integer such that and are perfect squares. The sum of such integers is Câu 4: Given two triangles ...
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Bài thi số 3

19:25 Câu 1:
A man drove a car from A to B at speed 60km/h. After arriving B, he took a rest for 30 minutes then turned back to A at speed 40km/h. Known that he started from A at 7:00 am and he reached A again at 3:15pm on the same day. The distance between A and B is km. Câu 2:
The minimum of the expression is Câu 3:
Given that is a positive integer such that and are perfect squares.
The sum of such integers is Câu 4:
Given two triangles and . Known that , and .
If then Câu 5:
How many real numbers are there such that ?
Answer: There are numbers . Câu 6:
The operation on two numbers produces a number equal to their sum minus 2.The value of is Câu 7:
ABC is a triangle. AM is the bisector of angle CAB. Given that AM = 4cm, AB = 6m and AC = 12cm.Then the measurement of angle BAC is degrees. Câu 8:
In the equation above, where is a constant.The greatest possible value of such that the equation has at least one solution is Câu 9:
and are positive integers such that , where is a prime number.
The number of pairs is Câu 10:
Given that .
Calculate:
=
(Input the answer as a decimal in its simplest form) Nộp bài
7
10 tháng 4 2017

câu 7 mk bấm nhầm đáp án là 120

qua B kẻ đường thẳng song song với AM cắt AC ở N.

vì AM là phân giác góc BAC nên có :

\(\dfrac{AC}{AB}=\dfrac{CM}{BM}=\dfrac{12}{6}=2\) suy ra \(\dfrac{CM}{BC}=\dfrac{CM}{CM+BM}=\dfrac{12}{12+6}=\dfrac{2}{3}\)

vì AM song song với BN nên có :

1,\(\dfrac{CA}{AN}=\dfrac{CM}{BM}=\dfrac{12}{AN}=2\) suy ra AN=6

2,\(\dfrac{AM}{BN}=\dfrac{CM}{BC}=\dfrac{2}{3}=\dfrac{4}{BN}\)suy ra BN=6

vì AB=6 nên tam giác ABN đều

suy ra \(\widehat{NAB}\)=\(60^0\)

\(\widehat{NAB}+\widehat{BAC}=\)\(180^0\)

nên \(\widehat{BAC}=\)\(120^0\)

7 tháng 4 2017

bài này bữa mình thi có 50đ à hehe