Nguyễn Ngọc Tường Vy's Profile

-Oxit :CuO,Fe₂O₃,HgO,PbO,Cu₂O,FeO,SO₂,CO₂,N₂O₅,MgO

-Oxit bazơ: MgO,CuO,Fe₂O₃,Cu₂O,FeO,K₂O,Na₂O,HgO,PbO,AL₂O₃

-Oxit axit: SO₂,CO₂,N₂O₅,NO,P₂O₅,SO_3,Na₂O,P₂O_3,CO,Cl₂O

theo tỉ lệ thể tích là 2:1

câu b.Dấu hiệu;có từ cầu khiến hãy

Dear Santa Claus,

My name is Sandy( Thảo Uyên) and I am 10 years old.I am living in VietNam with my family. I am studying in class 5/1 at Long Thành primary school.In this year, i do homework very hard and i have many stars in my class. I hope you will give me a set of lego.I promise to be a good student in my class. Finally, i wish you are always healthy and happy to give a a lot of gifts to children all over the world.

I love you so much and thank you in advanced!

Best wishes,

Sandy.

(2x+2)+(2x+2)*6=0

<=>(2x+2)*(1+6)=0

<=>2x+2=0

<=>2x=-2

<=>x=-1

5x*(x+3)=5x²-30

<=>5x²+15x=5x²-30

<=>5x²-5x²+15x=30

<=>x=2

<=>(3x-1+2-3x)*(3x-1-2+3x)=5x+2

<=>6x-3=5x+2

<=>6x-5x=2+3

<=>x=5