để trung hòa a gam dd NaOH 10% cần dùng vừa đủ 100ml dd H2SO4 1M. tính a

Nhanh nha mọi người!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

a) (3x^2-2x-4)(2x+5)-(3x-4)^2 b)(3x^2-4x-5)(4x-6)-(2x+4)(2x-4)

Mn giúp mình với,mình cần gấp ạ

IV. Rewrite sentences, using “I wish………..” 6. I really regret not working hard last year =>I wish …….…………………………………………… 7. My best friend regreted not buyin the house she liked last year =>My best friends wishes………………………… 8. They didn’t join Mary’s party and now they regret about it => I wish…………………………………………………… 9. Lan told her friend a lie and she felt sorry =>Lan wish …………………………………. 10. I am sorry I am late => I wish ……………………………………. Giúp mình nha mk vốt 5* ??? Uy tín nha

vẽ con chó bông màu trắng, đẹp ctlhn

(x+11)+(x+13)+(x+15)+...+(x+25)+(x+27)=189

Vẽ bức tranh về chủ đề '' hoa quả '' nha. Lưu ý : KO CHÉP MẠNG !!!

Calli : tèo teo Nl : Tưởng niệm giây phút tưởng niệm kỉ lục cụa Heo Dù top 3 thoi nhưng đủ làm mk mãn nguyện

I still remember my first day of school like it just happened yesterday, and it was one of the best days of my life. I live in a countryside, so my elementary school is a small and really old building. That day was on the beginning of September, and I had prepared for it all summer. Both of my parents took me to school at a very early time in the morning, and I were so excited that I could not sleep the night before. I went by that school many times, but that was the first time that I could actually get into and observe everything. My first teacher was also my aunt, and she took a really good care of me. She arranged me to sit at the first table because I was shorter than my friends. I could not make any friends that day, and later I was so sad about it. The first day always be the most impressive day, and I still remember every detail of it. Now I am in highschool, but that sweet memory is always in my heart. DỊCH