Giúp zới ạ
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a. Ta có: \(PTK_{Na_xPO_4}=23x+31+16.4=164\left(đvC\right)\)
\(\Leftrightarrow x=3\)
b. Ta có: \(M_{M_2SO_4}=NTK_M.2+32+16.4=142\left(đvC\right)\)
\(\Leftrightarrow NTK_M=23\left(đvC\right)\)
Vậy M là natri (Na)
c. Ta có: \(PTK_{Al_2\left(SO_4\right)_x}=27.2+\left(32+16.4\right).x=342\left(đvC\right)\)
\(\Leftrightarrow x=3\)
a, Ta có: 23x + 31 + 16.4 = 164 ⇒ x = 3
b, Ta có: 2MM + 32 + 16.4 = 142 ⇒ MM = 23
Vậy: M là Na.
c, Ta có: 27.2 + 96x = 342 ⇒ x = 3
Bạn tham khảo nhé!
My uncle moved to HCMC in 1987 and has lived there since then
is used to make cheese and butter
Lan if she would visit him the day after
is very wonderful to play sports in the summer
to go fishing when he was young
early enough to see the opening of the match
35/ My uncle moved to Ho Chi Minh City in 1987 and lived there since then.
36/ Milk is used to make cheese and butter.
37/ Ba asked Lan if she would visit him the next day.
38/ It is very wonderful to play sports in the summer.
39/ My grandfather used to go fishing when he was young.
40/ I wasn't early enough to see the opening of the match.
-Nhịp : 2/4
-Cao độ : thấp nhất là nốt A(là)
cao nhất là nốt D (Rế)
-Trường độ : Móc đơn , móc kép , nốt đen
-Kí hiệu : lặng đơn , dấu nối , dấu luyến
-Chia đc : 4 câu
a: \(A=\dfrac{x^2-3+x+3}{\left(x-3\right)\left(x+3\right)}\cdot\dfrac{x+3}{x}=\dfrac{x\left(x+1\right)}{x\left(x-3\right)}=\dfrac{x+1}{x-3}\)
b: |A|=3
=>A=-3 hoặc A=3
=>x+1=3x-9 hoặc x+1=-3x+9
=>-2x=-10 hoặc 4x=8
=>x=2(nhận) hoặc x=5(nhận)
1C
2C
3D
Chắc ko zọ