Mình bấm máy tính thì nó ghi là MATH ERROR => 0⁰ là vô lí, trong toán học ko có điều này

Tìm số nguyên dương x biết:  x . − 3 = − 9 ?

Cho hàm số y = f(x) liên tục trên đoạn [a;b]. Diện tích S  của hình phẳng giới hạn bởi đồ thị của hàm số y = f(x), trục hoành và hai đường thẳng x = a, x = b (a<b) được tính theo công thức:

A.  S = ∫ a b f ( x ) d x

B.  S = b ∫ a b f ( x ) d x

C.  S = ∫ a b f ( x ) d x

D.  S = ∫ a b f ( x ) d x

Choose A, B or C to fill in the blank.

Thinking about how we might be (1)............... in 10,20 or even 500 years is enough to make the mind melt. Will we still even be (2)…… planes (perhaps we (3) ............... flying our cars from Seattle to Paris)? What if in 100 years we could (4)............... straight to our next holiday destination?

While we (5)..............., engineers and designers all over the world are testing out what could become the (6) ............... of the future. Witness the just-launched prototype of the 'Superbus', (7)………. by CNN as the love child of a DeLorean and a stretch limo. We get die feeling these (8)…….. are often designed to be fast, fuel-efficient and, well, out-of-this-world.

Granted, some of them may never (9)............... to our roads, skies or 'teleportation passageways', but it's fun envisioning what the (10) ............... may hold.

Question 2. 

A. use

B. using

C. used

Choose the word that has main stress placed differently from the others.

A. handicapped

B. campaign

C. performance

D. donation

Choose the word whose underlined part has a different pronunciation from the others in each group

A. music

B. discuss

C. communicate

D. human