cho tam giác abc vuông tại a có sinB=1/6. Hãy tính tỉ số lượng giác của góc C ?

giải hệ pt và pt sau:

a) 3x-2y=3 và 2x+2y=2

b) x^2+7x-12=0

IV. Fill in the blanks with suitable words from the box.

Are you looking for a cheap, clean, (1)................................... source of power that doesn't cause (2) .................................. or waste natural resources? Look no further than solar (3) ..................................... from our sun.

At present, most of our (4) .......................................... comes from the use of coal and gas, oil or (5) .................................... power. This power could be provided by the sun.

Many countries are already using solar energy. Solar (6) .................................... are placed on the roofs of a house and the sun's energy is used to (7) ............................. water. The energy can be (8) ......................................... for a number of days, so on cloudy days you can use solar energy, too.

V. Choose the correct sentence among A, B, C or D

1. Long forgot his raincoat, so he got wet.

A. Long got wet because he forgot his raincoat.

B. Long got wet .However, he forgot his raincoat.

C. Long got wet, so he forgot his raincoat.

Circle A, B, C, or D which needs correction. Then correct them.

1. There are too much exhaust fume in the air in this city.

A B C D

2. My teacher spoke so quick that I didn’t understand what she meant.

A B C D

3. My teacher told me I was doing well; therefore, my final grade was bad.

A B C D

4. I suggest to have a separate basket for newspaper.

A B C D

5. A new school was built in the village recently.

A B C D