1.Robot will able to recongnise,guard, make a meal, do the housework,....

2. The robot won'n able to play football,.....

1.I do grow trees in the school 

2.I recycle paper, rubbish,... in city

2.We can do don'n thorw rubbish in street,Clean the streets

4.Because If we don't save the water, Water will be exhausted

My future house will be a UFO. It will be in a mountain. It will surrond by tall, old tree. By this UFO, I will be the first man come to Pluto.  My house will have robots use by solar energy, they will help me house work and take care of my pet.

My future house will be a UFO. It will be in a mountain. It will surrond by tall, old trees. By this UFO, I will fly around galaxy and be a first man come to Pluto. My house will have robots use by solar energy, they will help me housework and take care of my pet

a)\(\left(10^2+11^2+12^2\right)\div\left(13^2+14^2\right)\)

\(=\left(100+121+144\right)\div\left(169+196\right)\)

\(=365\div365\)

\(=1\)

b) \(1.2.3...9-1.2.3...8-1.2.3...8^2\)

\(=1.2.3...8\left(9-1-8\right)\)

\(=1.2.3...8.0\)

\(=0\)

d) \(1152-\left(374+1152\right)+\left(-65+374\right)\)

\(=1152-374-1152-65+374\)

\(=\left(1152-1152\right)-65+\left(374-374\right)\)

\(=0-65+0\)

\(=-65\)

e) \(13-12+11+10-9+8-7-6+5-4+3+2-1\)

\(=13-\left(12-11\right)+\left(10-9\right)+\left(8-7\right)-\left(6-5\right)-\left(4-3\right)\)\(+\left(2-1\right)\)

\(=13-1+1+1-1-1+1\)

\(=13+0+0+0\)

\(=13\)

\(=\frac{1}{4}.\left(\frac{4}{5.9}+\frac{4}{9.13}+...+\frac{4}{37.41}\right)\)

\(=\frac{1}{4}.\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+...+\frac{1}{37}-\frac{1}{41}\right)\)

\(=\frac{1}{4}.\left(\frac{1}{5}-\frac{1}{41}\right)\)

\(=\frac{1}{4}.\frac{36}{205}=\frac{9}{205}\)

\(\frac{1}{5.9}+\frac{1}{9.13}+\frac{1}{13.17}+...+\frac{1}{37.41}\)

\(=\frac{1}{4}\left(\frac{4}{5.9}+\frac{4}{9.13}+...+\frac{4}{37.41}\right)\)

\(=\frac{1}{4}\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+...+\frac{1}{37}-\frac{1}{41}\right)\)

\(=\frac{1}{4}\left(\frac{1}{5}-\frac{1}{41}\right)\)

\(=\frac{1}{4}.\frac{36}{205}=\frac{9}{205}\)

25:45= 55,(5) %

        =55,555555555 0k

=55(5)

Best friend

Hoặc Best friend forever (BFF):Bạn thân mãi mãi

bạn thân là BFF

mak BFF là một người luôn quan tâm giúp đỡ

và lúc nào cx có nhâu ở bên nhau

ko bỏ nhau lúc khó khăn hoạn nạn

x(2y-5)+2y=148

x(2y-5)+(2y-5)=148-5=143

(x+1)(2y-5)=143

.......

Vậy bằng bao nhiêu