\(\dfrac{5}{8}+\dfrac{3}{8}x=1\dfrac{1}{8}\)

\(\Rightarrow\dfrac{5}{8}+\dfrac{3}{8}x=\dfrac{9}{8}\)

\(\Rightarrow\dfrac{3}{8}x=\dfrac{9}{8}-\dfrac{5}{8}\)

\(\Rightarrow\dfrac{3}{8}x=\dfrac{4}{8}\)

\(\Rightarrow x=\dfrac{4}{8}:\dfrac{3}{8}\)

\(\Rightarrow x=\dfrac{4}{8}\cdot\dfrac{8}{3}=\dfrac{4}{3}\)

\(---\)

\(\dfrac{1}{2}-\left(\dfrac{1}{3}x-2\right)=\dfrac{2}{3}\)

\(\Rightarrow\dfrac{1}{3}x-2=\dfrac{1}{2}-\dfrac{2}{3}\)

\(\Rightarrow\dfrac{1}{3}x-2=-\dfrac{1}{6}\)

\(\Rightarrow\dfrac{1}{3}x=-\dfrac{1}{6}+2\)

\(\Rightarrow\dfrac{1}{3}x=\dfrac{11}{6}\)

\(\Rightarrow x=\dfrac{11}{6}:\dfrac{1}{3}\)

\(\Rightarrow x=\dfrac{11}{6}\cdot3=\dfrac{11}{2}\)

\(---\)

\(\left(3x+4\right)\left(2x-3\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}3x+4=0\\2x-3=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}3x=-4\\2x=3\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-\dfrac{4}{3}\\x=\dfrac{3}{2}\end{matrix}\right.\)

\(--\)

\(-4+4x=9x-14\)

\(\Rightarrow4x-9x=-14+4\)

\(\Rightarrow-5x=-10\)

\(\Rightarrow x=\left(-10\right):\left(-5\right)=2\)

\(---\)

\(\left\{\left[\left(\dfrac{1}{25}-0,6\right)^2:\dfrac{49}{125}\right]\cdot\dfrac{5}{6}\right\}-\left[\left(\dfrac{-1}{3}\right)+\dfrac{1}{2}\right]\)

\(=\left[\left(-\dfrac{14}{25}\right)^2\cdot\dfrac{125}{49}\right]\cdot\dfrac{5}{6}-\dfrac{1}{6}\)

\(=\left(\dfrac{196}{625}\cdot\dfrac{125}{49}\right)\cdot\dfrac{5}{6}-\dfrac{1}{6}\)

\(=\dfrac{4}{5}\cdot\dfrac{5}{6}-\dfrac{1}{6}\)

\(=\dfrac{4}{6}-\dfrac{1}{6}\)

\(=\dfrac{3}{6}\)

\(=\dfrac{1}{2}\)

\(Toru\)

12. \(\dfrac{4\sqrt{3}}{3}\pi\)

13. \(12\pi\)

14. \(\sqrt{6}\pi a^2\)

Giúp e mấy bài đó đi mn ạ

1. a. Số đợt nguyên phân: 4 lần

    b. 2n= 6

2. a. TB tham gia nguyên phân: 10

    b. 2n= 16

3. a. Tên loài: Ruồi giấm

    b. Số lần nguyên phân: 3

4. A: 4

    B: 2

    C: 1

    D: 5

5. a. Hợp tử: 120

    b. Nhóm 1: 240

        Nhóm 2: 640

        Nhóm 3: 1600

6. a. A= 1; B= 3; C= 6; D= 9

    b. A= 1; B= 7; C= 63; D= 511

    c. 2n= 8

3990/3993;5985/5989;5985/5990;7980/7985;7980/7986

Quy đồng mẫu số: 1/2 ; 2/3 và 3/5

MSC: 30

Quy đồng:

1/2 = 1x15/2x15 = 15/30

2/3 = 2x10/3x10 = 20/30

3/5 = 3x6/5x6 = 18/30

MSC :30

=> \(\frac{1x15}{2x15}\text{=}\frac{15}{30};\frac{2x10}{3x10}\text{=}\frac{20}{30};\frac{3x6}{5x6}\text{=}\frac{18}{30}\)

\(\frac{1}{2}=\frac{1\cdot15}{2\cdot15}=\frac{15}{30}\)

\(\frac{2}{3}=\frac{2\cdot10}{3\cdot10}=\frac{20}{30}\)

\(\frac{3}{5}=\frac{3\cdot6}{5\cdot6}=\frac{18}{30}\)

                             #Hoq chắc _ Baccanngon

có tất cả 10 số nha 

Vì mọi số nhân với 0 đều bằng 0, mà 0 x X = 4

=> x thuộc rỗng

P/s: làm như vầy là đc