1. In summer, it's sunny and windy

2. I often see Lan going to work early

D

tại vì 'it' thay thế cho 'the ice' nên 'it' nằm vị trí tân ngữ 

Ta có:(x²-y²)\(.\dfrac{x^2+y^2}{y^4-x^2y^2}\)\(=\left(x^2-y^2\right).\dfrac{x^2+y^2}{y^2\left(y^2-x^2\right)}=-\dfrac{x^2+y^2}{y^2}\)

Ta có:\(\dfrac{4x^2-9y^2}{xy}:\left(2x-3y\right)=\dfrac{\left(2x-3y\right)\left(2x+3y\right)}{xy}.\dfrac{1}{\left(2x-3y\right)}=\dfrac{2x+3y}{xy}\)

C

anh tính sai r

sorry sai kết quả

\(\dfrac{1}{2}-\dfrac{33}{98}=\dfrac{16}{49}\)