Lời giải:
Xem hình
+)FeO⇒%mFe=$\frac{56}{56+16}$ .100≈77,78% (%mO=100%-%mFe)
+)Fe3O4⇒%mFe=$\frac{56.3}{56.3+4.16}$ .100≈72,41%(%mO=100%-%mFe)
+)Fe2O3⇒%mFe=$\frac{56.2}{56.2+16.3}$ .100%=70%(%mO=100%-%mFe)
+) Fe(OH)2⇒%mFe=$\frac{56}{56+(16+1).2}$ .100%≈62,22%(%mO=100%-%mFe)
+) Fe(OH)3⇒%mFe=$\frac{56}{56+(16+1).3}$ .100%≈52,34%(%mO=100%-%mFe)
Giải phương trình 5$\sqrt[]{1+x^{2}}$ = 2($x^{2}$ +2)
you should buy this dictionary -> you had...................................
3. Anabella has been said to be an haunted doll. ~> People.... *
II. Report the statements 13.“I want to leave university and find a job,” said Laura. Laura announced ..................................................................................................... 14. “You should finish your degree first.” said her tutor. Her tutor advised ...................................................................................................... 15. “You’ll never find a good job if you drop out,” her father said. Her father warned..................................................................................................... 16. “I’ll let you stay at my flat until you find a place to live,” said her best friend. Her best friend offered.............................................................................................. 17.“I think you should ask your tutor for advice,” said her sister. Her sister suggested................................................................................................. 18.“I’ll buy you a car when you graduate,” said her grandmother. Her grandmother promised....................................................................................... III. Read the text below and think of the word which best fits each gap. Use only one word in each gap. DANIELA: SKATEBOARD CHAMPION I’ve always (19) ............................... an outdoors kind of girl, and (20) ............................... a kid, I’d get up to all sorts of stuff with my friends - climbing trees and messing about in the woods. As we got older, my friends started doing other things (21) ............................... shopping and listening to music, but I still loved being outside and needed a new challenge. (22) ............................... was my brother who first got me (23) ............................... skateboarding. I’d seen him practicing on his board hour after hour, and to (24) ............................... honest, I used to think it was uncool. But when he showed me some amazing tricks he could do one day, I had to give it a go. I’ve got a competitive streak, so I watched loads of skateboarding clips online and got out on my board whenever I could - even (25) ............................... it was dark - in order to compete (26) ............................... my brother. It obviously paid (27) ............................... because I beat him in a competition last month!
Làm hộ mình bài 1, với bài 2 câu 8 và bài cuối nhé Cảm ơn ạ🙇🏻♀️
cho m,n là tổng của 4 số chính phương, chứng minh tích của m,n cũng là tổng của 4 số chính phương
Giúp mình với! Tại sao chỗ này lại ra được vậy?
hình học cho tam giác MNP có MN=MP. gọi H kà trung điểm K rao cho HM=HK . chứng minh rằng a,tam giác MHN=tam giác MHP b,MN là tia phân giác của góc NMP c,,MN vuông góc NP d,MN song song PK
Mn giúp em câu này vs ak Em sẽ đánh giá 5*
nêu cảm nhận của em về hình ảnh người bà( bằng các gạch đầu dòng)
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
