1,3-2,25 помогите плиз​

Помогите

1/She ... a brush at the haberdashery last Sandey.

a)bought

b)buys

c) has bought

2/Carol ...already ... a blue scarf for her mother.

a)have chosen

b)chose

c)has chosen

Спасите-помогите! (x+3)/(x-3)+(x-3)/(x+3)-(4(x-6))/(9-x^2)=0 нужно подробное решение