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: 2M_M + 32 + 16.4 = 142 ⇒ M_M = 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
Bài hát được chia làm: 4 câu

-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)

????

hình như lỗi ảnh bạn ạ

EM ĐNG CẦN GẤP NÊN MN LÀM NHANH NHẤT CÓ THỂ HỘ EM Ạ !!! ( Thanks )