1, I can't finish this task if you don't give me a hand. 

2, If you stop wasting money you will run out of it.

3, Don't call me if it isn't an emergency 

4,Jame won't pass the test if he studies harder.

5,Jane will dine out with her friends if she finishes her work before 6 pm.

6,My brother doesn’t find a companion if  he won’t go travelling this summer

7, It is not easy to do these exercises if you listen attentively to the teacher

8, Jim will be punished by the teacher if he doesn’t submit his essay before Tuesday 

Đẳng thức nào đúng:

 A.(x-3)^2=x^2+6x+9                              B.(x-3)^2=9-x^2

C.(x-3)^2=9-6x+x^2                               D.(x-3)^2=x^2-3x+9

\(32,5:0,25+\dfrac{39}{7}.\dfrac{4}{13}.420-60\%.35.\dfrac{1}{3}\)

\(\dfrac{325}{10}:\dfrac{1}{4}+\dfrac{39}{7}.\dfrac{4}{13}.420-60\%.35.\dfrac{1}{3}\)

\(\dfrac{325}{10}.4+\dfrac{12}{7}.420-\dfrac{3}{5}.35.\dfrac{1}{3}\)

\(130+\dfrac{1}{5}-\dfrac{3}{7}.\dfrac{1}{3}\)

\(\dfrac{651}{5}-\dfrac{1}{7}\)

\(\dfrac{4552}{35}\)

Cho tam giác ABC có 90 độ < B < 135 độ, C < 45 độ. Kẻ AD vuông góc với BC. CHứng minh BD < AD < CD