cả 2 bn có số viên bi là:

35+29=64 viên bi

k mk rùi mk kb

I.write sentences using the words given

1.what/you/do/this summer vacation?

=>What are you going to do on this summer vacation?

2.the mekong river/long/than/the red river

=>The Mekong River is longer than the Red river.

3.what/weather/like/fall?

=>What is the weather like in fall?

4.they always/go/jog/friends/winter

=>They always go jogging with their friwnds in winter.

5.when/windy,they/go/sail

=>When it is windy,they go sailing

6.minh/tall/student/class

=>Minh is the tallest student in my class.

II. Rewrite the following sentences

1.let's play a game of chess.

=>Why don't we play a game of chess

2.does vn have any deserts?

=>Are there any deserts in Viet Nam?

3.no one in the class in better than her.

=>She is best student in the class

4.she would like to listen to some music now.

=>She wants to listen to some music now.

5.my sister's teeth are small and white

=>My sister has small and white teeth

6.london has a population of 6.3 million. There are 6,3 million people in London.

cảm ơn người ta mà như thế cơ à !

xⁿ+x²+x+1

=x²(x^n-2+1)+(x+1)

=(x²+1)(x^n-2+1)

\(A=4x^2+2y^2+14z^2-4xy+12xz-10yz-2z+6=\left(4x^2+y^2+9z^2-4xy-6yz+12xz\right)+\left(y^2-4yz+4z^2\right)+\left(z^2-2z+1\right)+5=\left(2x-y+z\right)^2+\left(y-2z\right)^2+\left(z-1\right)^2+5\ge5\)

\(\Rightarrow MinA=5\Leftrightarrow\hept{\begin{cases}2x-y+z=0\\y-2z=0\\z-1=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=-\frac{1}{2}\\y=2\\z=1\end{cases}}\)