Hoà tan a gam Fe vào dd H2SO4 đặc, nóng, dư thì thu được khí (A). Hấp thụ hoàn toàn A trong dung dịch có chứa 0,2 mol NaOH thì thu được 200 ml dd (M). Hãy tính giá trị của a trong mỗi trường hợp sau: 6.1 Trong (M) có 2 muối với số mol bằng nhau. 6.2 Trong (M) CM NaOH = 0,2M C=12 H=1 O=16 Mg=24 S=32 Cu=64 Al=27 Na=23 Cl=35,5 Fe=56 Giúp mình với ạ !,!,,!

I.Change these sentences into the passive voice. 1. What did you do to solve this problem? 2. I heard someone singing in the next room. 3. She is having her sister iron her clothes. 4. People say that three men were arrested after the explosion. (2 cách) 5. By this time next year, Hong will have finished the course.

vì sao sống cống hiến làm cho cuộc sống của bản thân ý nghĩa hơn

I. Put the following sentences into Reported Speech. 1. “I have already read your letter,” my friend said to me. My friend said 2. Carol said to me, “I will tell you about that problemCarol told 3. He said, “I don’t understand these two lessons at all.” He said (that) 4. “I know this girl quite well,” Mary said.Mary said 5. Tom said to me, “I have to leave the office before 3.00 p.m.” Tom told 6. “I don’t like this film,” she said 7. George said, “I can’t possibly finish the work by that time.” 8. Mr. Anderson said “I’m having a bath,” 9. “Mr. Brown said “I must do my homework now,” 10. “Your health will improve very quickly,” the doctor said to me

Trong bài thơ thân em...như bần trôi hình ảnh những con vật trong bài ca dao tượng trưng cho kiểu xã hội nào

Tìm GTNN của C=|x-10|+|x-11|+|x-12|+|x-13|

cho hình thang ABCD. Đáy AB=40cm, CD=8cm, BC=50cm, AD=30cm. CMR: ABCD là hình thang vuông

cho dạng đúng của động từ trong ngoặc 1.My sister(get)...............married last month. 2.Daisy(come)............to her grandparents' house 3 days ago 3 .My computer(be).............broken yesterday. 4.He (buy)..........me a big teddy bear on my birthday last week 5.My friend (give).................me a barif chocolate when I (be)................at school yesterday. 6.My children(not do).................their homework last night 7. You (live) ........here five years ago? 8.They(watch).............TV late at night yesterday. 9.Your friend (be)...............at your house last weekend? 10.They (not be)..............excited about the film last day

1. He hides the broken cup in the drawer. - The ___________________________________________________ 2. They keep this room tidy all the time. - This ___________________________________________________ 3. They all voted the party a great success. - The ___________________________________________________ 4. We gave Ann some bananas and some flowers. - Ann ___________________________________________________ 5. Our friends send these postcards to us. - These ___________________________________________________ 6. Tim ordered this train ticket for his mother. - This ___________________________________________________ 7. They moved the fridge into the living room. - The fridge _________________________________________________ 8. The German didn’t build this factory during the Second World War. - This ___________________________________________________ 9. The Greens are going to paint these cards for Christmas Day. - These ___________________________________________________ 10. Ann had fed the cats before she went to the cinema. - The cats __________________________________________________ 11. The students have discussed the pollution problems since last week. - The ___________________________________________________ 12. The thieves can't steal the most valuable painting in the national museum. - The most ___________________________________________________ 13. Some people will interview the new president on TV. - The new ___________________________________________________ 14. People speak French and English in Canada. - French and _________________________________________________ 15. She is going to repair those shoes. - Those ___________________________________________________ 16. He has broken his nose in a football match. - His ___________________________________________________

p tích đa thức thành nhân tử a,x^2-y^2+3x-3y b,4x^2-y^2-2x+y c,x^2-y^2-2y-1 nhanhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh