Tìm GTNN của biểu thức:

a) A=\(25x^2+3y^2-10x+11\)

b) B=\(\left(x-3\right)^2+\left(x-11\right)^2\)

c) C=\(\left(x+1\right).\left(x-2\right).\left(x-3\right).\left(x-6\right)\)

Tìm x,y biết : \(\frac{5+x}{9+y}=\frac{5}{9}\) ( với y khác -9 ) và x+y=28

CẦN GẤP LẮM LẮM!!!!!!!!!!!!!!!!!!

Tìm x biết: 81.x^3=49x

Complete the sentences with the correct form of one of the verbs in the box:

burn replace generate make save turn drive heat

1. The freezing temperatures have ______ the water in the lake into ice.

2. Coal is a non-renewable source of energy, because it cannot be early _______ .

3. In the pout people used fine to ______ their homes, but ________ we have electric hoover.

4.75% of Fance's electricity is _______ by muclear reactor.

5. last night see ________ to the air part.

1. ______ festival do you choose?- I choose Elephant Race Festival.

A. What B. How C. Which D. When

2. He thinks elephants are _____ animals.

A. fascinated B. fascinating C. fascinates D. fascinate

find the odd one out A,B,C or D:

1. A. cinema B. comedy C. film D. cartoon

2. A. actor B. actress C. character D. audience

3. A. fightening B. exciting C. terrifying D. entertaining