3,72 + x = 6,54

           x = 6,54 - 3,72

           x = 2,82

9,6 - x = 3,2

        x = 9,6 - 3,2

        x = 6,4

\(3,72+x=6,54\)

\(x=6,54-3,72\)

\(x=2,82\)

\(9,6-x=3,2\)

\(x=9,6-3,2\)

\(x=6,4\)

 Đáp án : 

 x = 0 

 Nhớ tích ~ !!! Thanks !!

theo mik x=0

hok tốt

1,3:x+0,3:x=0,25

(1,3+0,3):x=0,25

1,6:x=0,25

x=1,6:0,25

x=6,4

k nha

chúc bạn học giỏi

6,4 nha bn

7,5*x+1,5*x+x=48

7,5*x+1,5*x+x*1=48

       x*(7,5+1,5+1)=48

       x*10=48

       x=48:10

       x=4,8

Chúc học tốt!!!

\(7,5\cdot x+1.5\cdot x+x=48\)

\(x\left(7.5+1.5+1\right)=48\)

\(10x=48\)

\(x=\frac{24}{5}\)

\(\frac{x+9}{13-x}=\frac{6}{5}\)

\(\Rightarrow\orbr{\begin{cases}x+9=6\\13-x=5\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-3\\x=8\end{cases}}\)

\(\frac{120-x}{30}=3\frac{1}{2}\)

\(\Rightarrow\frac{120-x}{30}=\frac{7}{2}\)

\(\Rightarrow\frac{120-x}{30}=\frac{105}{30}\)

\(\Rightarrow120-x=105\)

\(\Rightarrow x=120-105\)

\(\Rightarrow x=15\)

tả hiểu

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(x\cdot4+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(x\cdot4+\left(\frac{8}{16}+\frac{4}{16}+\frac{2}{16}+\frac{1}{16}\right)=1\)

\(x\cdot4+\frac{13}{16}=1\)

\(x\cdot4=1-\frac{13}{16}\)

\(x\cdot4=\frac{3}{16}\)

      \(x=\frac{3}{16}:4\)

      \(x=\frac{3}{64}\)

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(=\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(=4x+\frac{15}{16}=1\)

\(\Rightarrow4x=1-\frac{15}{16}=\frac{1}{16}\)

\(\Rightarrow x=\frac{1}{16}:4=\frac{1}{64}\)