Question

Rút gọn các biểu thức sau:

10 - 3x(x - 5) + 3(x² - 4x)-3x

5^{y + 1} - 4.5^y

Answer 1

1)10x-3x(x-5)+3(x²-4x)-3x

<=>3(x²-4x)+10x-3x-3x(x-5)

<=>3(x²-4x)=7x-3x(x-5)

<=>3x²-12x+7x-3x²+15x

<=>3x²-3x²-12x+7x+15x

<=>-12x+7x+15x

<=>10x

2)5^y+1-4.5^y

<=>5¹.5^y-4.5^y

<=>5^y(5¹-4)

<=>5^y.1

<=>5^y

 

Answer 2