Giúp mình với mình đang gấp
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Giúp mình với mình đang cần rất gấp , vì mình đang thi
MN
3 tháng 8 2021
\(n_{Fe_3O_4}=\dfrac{8}{232}=\dfrac{1}{29}\left(mol\right)\)
\(Fe_3O_4+8HCl\rightarrow FeCl_2+2FeCl_3+4H_2O\)
\(\dfrac{1}{29}.......\dfrac{8}{29}................\dfrac{2}{29}\)
\(m_{HCl}=\dfrac{8}{29}\cdot36.5=10.06\left(g\right)\)
\(m_{FeCl_3}=\dfrac{2}{29}\cdot162.5=11.21\left(g\right)\)
NT
1
DT
1
O
25 tháng 3 2022
a) \(\dfrac{3}{4}+\dfrac{9}{5}\div\dfrac{3}{2}-1=\dfrac{3}{4}+\dfrac{18}{15}-1=\dfrac{39}{20}-1=\dfrac{19}{20}\)
b) \(\dfrac{6}{7}\cdot\dfrac{8}{13}+\dfrac{6}{13}\cdot\dfrac{9}{7}-\dfrac{4}{13}\cdot\dfrac{6}{7}=\dfrac{48}{91}+\dfrac{54}{91}-\dfrac{24}{91}=\dfrac{48+51-24}{91}=\dfrac{78}{91}=\dfrac{6}{7}\)
c) \(\dfrac{-3}{7}+\left(\dfrac{3}{-7}-\dfrac{3}{-5}\right)\)\(=\dfrac{-3}{7}+\left(\dfrac{-3}{7}-\dfrac{-3}{5}\right)=\dfrac{-3}{7}+\dfrac{6}{35}=-\dfrac{9}{35}\)
25 tháng 2 2021
ờ...tớ ko nhầm thì thừa are
nếu bỏ are thì she's making a papper boat
25 tháng 12 2021
a: Xét tứ giác AEHF có
\(\widehat{AEH}=\widehat{AFH}=\widehat{FAE}=90^0\)
Do đó: AEHF là hình chữ nhật
BH
1
DT
Đỗ Thanh Hải
CTVVIP
8 tháng 10 2021
1 How long do you live in HN
2 How often did you go to the movies
3 What did Mrs Robinson buy
4 When was your father in Nghe An
5 How do they go to school
6 Why didn't she go to class
7 Who left home at 7o'clock yesterday
8 What subject does he study in the high school
9 What is your favorite hobby
10 How far is it
TB
Các bạn giúp mình với mình đang cần rất gấp, giúp mình nha!!!!!!!!!
1
14 tháng 12 2023
3. are there any eggs?-No, there aren't some
4.is there any salt?- yes, there is any
5.are there any carrots?-yes, there are some
6.are there any apples?-no there aren't some
7.is there any suger?-yes, there is any
8.are there any cakes?-no there aren't some
9.is there any butter?-no. there isn't any
10. is there any mineral water?- yes. there is any
T
0
giúp mình với mình đang gấp
B
31 tháng 5 2023
SIMPLE PRESENT
1 Cars are produced in this factory.
2 Wheat is grown in the fields by the farmer.
3 The cows are milked by Mrs. Jones twice a day.
4 Wildlife photographs are taken by Mary every weekend.
Bị động hiện tại đơn: S+am/is/are+PII+(by O)+........
PRESENT CONTINUOUS
1 A new clinic is being built in the town.
2 Brownies are being baked by the children today.
3 Our homework is being done.
4 The car is being washed by the father.
Bị động thì hiện tại tiếp diễn: S+am/is/are+being + PII+( by O)+.........
PRESENT PERFECT
1 The book has already been discussed.
2 All the housework has been finished.
3 All their money has been lost.
4 His car has been crashed.
Bị động hiện tại hoàn thành: S+has/have+been+PII+(by O)+.......
PAST SIMPLE
1 The Harry Potter books were written by J K Rowling.
2 Their car was left in the garage.
3 All the washing was done yesterday.
4 Her wash was lost in the cinema
Bị động thì quá khứ đơn: S+was/were+PII+(by O)+.......
PAST CONTINOUS
1 The dishes were being washed when she arrived.
2 His homework was being done when the phone rang.
3 His car was being driven too fast.
4 The hall was being decorated for the party.
Bị động thì quá khứ tiếp diễn: S+ was/were+being + PII+(by O)+.....
PAST PERFECT
1 All his work had been finished before he left.
2 All the milk had been delivered by the milkman by 6 o'clock.
3 The crime scene had been left by the thieves before the police arrived.
4 The door had already been locked before the burglars tried to enter.
Bị động thì quá khứ hoàn thành: S+ had been + PII+(by O)+.....
FUTURE SIMPLE
1 More workers will soon be hired by the company.
2 THe snake will be killed if it comes any closer.
3 The lawn will be mown by my dad tomorrow.
4 The man will be bitten by the dog if the garden is come into by him.
Bị động thì tương lai đơn: S+will be+PII+(by O)+........
FUTURE-Be going to
1 All his debt is going to be paid
2 The murder is going to be investigated by the police.
3 The poachers are going to be shot on sight.
4 Several prisoners are going to be released.
Bị động thì tương lai gần: S+am/is/are+going to be+ PII+(by O)+......
MODAL
1 My car must be washed.
2 The children must be taught how to read by the teacher.
3 Her hair must be cut before the wedding.
4 The dog must be taken to the vet.
INFINITIVE
1 All the letters have to be delivered by the postman.
2 Our tickets have to be booked for the flight.
3 A new will has to be drawn up.
4 The light bulb has to be changed before it gets dark.
Bị động với V khuyết thiếu: S+V khuyết thiếu + be + PII+(by O)+......
\(Errink \times Cream\)
chiều rộng hình chữ nhật là:
54:(8-5)x5=90(m)
chiều dài hình chữ nhật là:
54+90=144(m)
chu vi hình chữ nhật là:
(144+900):2=522(m)
diện tích hình chữ nhật là:
144x900=129600(m2)