=16+27-7x6-94x7+27x99

=2700-700+16

=2016

a. $\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}$

$=(\dfrac{14}{15}+dfrac{1}{15})+(\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{10}{22})$

$=1+1=2$

b. $74\times43-43+27\times43$

$=(74-1+27)\times43$

$=100\times43=4300$

\(a)\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}\)

\(=\left(\dfrac{14}{15}+\dfrac{1}{15}\right)+\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{5}{11}\)

\(=1+1=2\)

\(b)74\times43-43+27\times43\)

\(=43\times\left(74-1+27\right)\)

\(=43\times100=4300\)

3a = 4b = 8c => \(\frac{a}{3}=\frac{b}{4}=\frac{c}{8}\)

Áp dụng tính chất của dãy tỉ số bằng nhau , ta có :

\(\frac{a}{3}=\frac{b}{4}=\frac{c}{8}=\frac{a+b+c}{3+4+8}=\frac{22}{15}\)

\(\hept{\begin{cases}a=\frac{22}{15}.3=\frac{22}{5}\\b=\frac{22}{15}.4=\frac{88}{15}\\c=\frac{22}{15}.8=\frac{176}{15}\end{cases}}\)

Vậy .........

3a=4b=8c => \(\frac{a}{3}=\frac{b}{4}=\frac{c}{8}\)

Áp dụng tính chất của dãy tỉ số bằng nhau , ta có :

\(\frac{a}{3}=\frac{b}{4}=\frac{c}{8}=\frac{a+b-c}{3+4-8}=\frac{22}{-1}\)\(=-22\)

\(\hept{\begin{cases}a=-22.3=-66\\b=-22.4=-88\\c=-22.8=-176\end{cases}}\)

Vậy ............

Khái niệm: Cách mạng công nghiệp hay còn gọi là Cách mạng công nghiệp lần thứ nhất là cuộc cách mạng trong lĩnh vực sản xuất; là sự thay đổi cơ bản các điều kiện kinh tế xã hội, văn hóa và kỹ thuật, xuất phát từ nước Anh sau đó lan tỏa ra toàn thế giới.

Thời gian: Cuối thế kỷ 18-đầu thế kỳ 19

Diễn ra ở Anh và Mỹ

\(2\sqrt{9\left(x-3\right)}-\sqrt{4\left(x-3\right)}=10+\frac{1}{2}\)

\(6\sqrt{\left(x-3\right)}-2\sqrt{\left(x-3\right)}=\frac{21}{2}\)

\(4\sqrt{\left(x-3\right)}=\frac{21}{2}\)

\(\sqrt{\left(x-3\right)}=\frac{21}{8}\)

\(x-3=\frac{441}{64}\)

\(x=\frac{633}{64}\)

help

1 Products are advertised mainly through the media so that consumers become familiar with the variety of products available

2 Large companies employ advertising agencies so as to make their product attractive to consumers

3 Companies spend millions of dollars on advertising with the aim of increasing their sales

4 Advertisers must consider their advertisements carefully for fear of being accused of persuading people to buy things they don't need

5 All advertisement are reviewed by a consumer protection agency in case false information is given to the public

6 How do they travel to work?

7 Who speaks French very well?

8 What makes people different from all other animals?

IV

1 Because Nathan missed the bus, he was late for school

2 Keep the food covered or the flies will contaminate it

3 Julie hadd a guitar and she plays it very well

4 I need to study hard so I can get a good score on the test

5 Although he seemed a friendly person, I didn't like him

6 The food looks delicious but it tastes horrible

7 Mason fell because the floor was wet

8 Anna needed some money so she took a part-time job

1/ Nathan missed the bus because he was late for school.

2/Keep the food covered or the flies will contaminate it.

3/Julie has a guitar and she play it very well.

4/I need to study hard so I can get a good score on the test.

5/Although he seemed a friendly,I didn't like him.

6/The food looks deliciou but it tastes horribie.

7/ Mason fell because the floor was wet.

8/Anna took a part-time job so she needed some money.