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LT
1
8 tháng 9 2023
\(\%Fe_{FeCl_3}=\dfrac{56}{56+35.5\cdot3}\simeq34,46\%\)
Fe không có trong CuSO4 nha bạn
10 tháng 9 2023
\(M_{KNO_3}=39+14+16\cdot3=101g/mol\\ M_{H_2SO_4}=1\cdot2+32+16\cdot4=98g/mol\\ M_{CuSO_4}=64+32+16\cdot4=160g/mol\\ M_{Al\left(OH\right)_3}=27+\left(1+17\right)\cdot3=78g/mol\\ M_{NaCl}=23+35,5=58,5g/mol\)
16 tháng 9 2023
Viết lại bài với chính xác tương đối (không mắc lỗi nghiệm trọng)
My best friend is Thanh An. We came to the same Archimedes School, and we have been friends for 1 year. Thanh An is not short and not tall, he has a normal height. He had a short black hair and a big black eyes. He is very kind and smart, especially in Math. He is funny too, he makes me laugh even when I feel bad. I like to be friends with him. Because he is very smart at Math, we created a Zalo group to do our homework. I will tell you my secret: I sometimes copy his Math homework too (HAHAHA). I hope that I can be friends with him forever.
H
0
DT
Đỗ Thanh Hải
CTVVIP
3 tháng 8 2021
1 He is told to take a long rest
2 This plant isn't watered everyday
3 Beer is drunk all over the world
4 Uniform is worn to school by students
5 Reports are sent to the manager by the secretary in the afternoon
6 How many languages are spoken in Canada?
Bài 2
1 I was brought this dish by the waiter
2 I wasn't showed the special cameras
3 Her ticket was showed to her friends
4 The broken cup was hidden in the drawer by Tom
5 The fridge wasmoved into the living room by his uncle
HN
0
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 7 2021
1 some eggs
2 any cakes
3 some water
4 any strawberries
5 an elephant
6 a train
Bài 7
1 How much
2 How many
3 How many
4 How many
5 How many
6 How much
7 How many
8 How much
2 tháng 8 2021
a) Ta có: \(\dfrac{3}{2}\sqrt{12}+\sqrt{75}-\sqrt{300}+\sqrt{27}\)
\(=3\sqrt{3}+5\sqrt{3}-10\sqrt{3}+3\sqrt{3}\)
\(=\sqrt{3}\)
b) Ta có: \(\sqrt{14-6\sqrt{5}}+\sqrt{9-4\sqrt{5}}\)
\(=3-\sqrt{5}+\sqrt{5}-2\)
=1
