d

3/4

Số lớn là 60x3/4=45

Số nhỏ là 60-45=15

chúc mừng các bẹn nhe

$\frac{3a-5b}{a+2b}=\frac{4}{7}$

$\Rightarrow 7\left(3a-5b\right)=4\left(a+2b\right)$

$\Rightarrow 21a-35b=4a+8b$

$\Rightarrow 21a-4a=8b+35b$

$\Rightarrow 17a=43b$

$\Rightarrow \frac{a}{b}=\frac{43}{17}$

1 $m^2$

1. You should able->be able to improve your English

2. I don't mind to give->giving a hand to the poor 

3. You must see the positive sides of use->using the computer 

4. I spend most my->of my spare time looking after the garden

5. That book sounds greatly->great

6. We work volunteers->as volunteers for an animal organisation 

7. I was kind of addicted->being addicted to the net 

8. Computers play->play an important part in our lives 

5x−3+(x−5)(x+4)−7=5x−3+x2+4x−5x−20−7=x2+4x−30