x+15%.x=115

x+3/20.x=115

x.(1+3/20)=115

x.23/20=115

=>x=115:23/20

x=100

\(x+15\%\times x=115\)

\(x\times1+\frac{1}{4}\times x=115\)

     \(x\times\left(1+\frac{1}{4}\right)=115\)

                \(x\times\frac{5}{4}=115\)

                        \(x=115:\frac{5}{4}\)

                        \(x=92\)

\(x+15\%\times x=115\)

 \(x+\frac{3}{20}\times x=115\)

\(x\times\left(\frac{3}{20}+1\right)=115\)

\(x\times\frac{23}{20}=115\)

         \(x=115:\frac{23}{20}\)

         \(x=100\)

x+15+100=115

x+15=115-100

x+15=15

x=15-15

x=0

x+4.25=100

x+100=100

x=0

\(\frac{x+115}{15}+\frac{x+119}{19}=\frac{x+217}{117}+\frac{x+327}{227}\)

\(\Leftrightarrow\left(\frac{x+115}{15}-1\right)+\left(\frac{x+119}{19}-1\right)=\left(\frac{x+217}{117}-1\right)+\left(\frac{x+327}{227}-1\right)\)

\(\Leftrightarrow\frac{x+100}{15}+\frac{x+100}{19}=\frac{x+100}{117}+\frac{x+100}{227}\)

\(\Leftrightarrow\frac{x+100}{15}+\frac{x+100}{19}-\frac{x+100}{117}-\frac{x+100}{227}=0\)

\(\Leftrightarrow\left(x+100\right)\left(\frac{1}{15}+\frac{1}{19}-\frac{1}{117}-\frac{1}{227}\right)=0\)

\(\Leftrightarrow x+100=0\)

\(\Leftrightarrow x=-100\)

x+3/20.x=115

x.(1+3/20)=115

x.23/20=115

x=115:23/20

x=100

X=100                                                                                                

Ta có:x+15%.x=115

=>x+3/20.x=115

=>x.1+3/20.x=115

=>x.(1+3/20)=115

=>x.23/20=115

=>x=115:23/20

=>x=100

ĐỪNG QUÊN **** ĐÓ NHA!!!

tìm x , biết

a, x + 10 = 1500

    x        = 1500 - 10

    x        = 1490

b, x + 15 = 115

   x         = 115 - 15

   x         = 100

a,x=1490

b,x=100

a, x + 10 = 1500

  x = 1500-10

x = 1490

b, x + 15 = 115

x = 115 - 15 

x = 100

x+15%.x=115

x(1+15%)=115

x.\(\frac{23}{20}\)=115

x=115:\(\frac{23}{20}\)

x=100

Nhớ cho đúng nha:

          \(x+15\%\times x=115\)

           \(x+\frac{15}{100}\times x=115\)

       \(x\times\left(1+\frac{3}{20}\right)\)\(=115\)

           \(x\times\frac{23}{20}\)           \(=115\)

           \(x\)                       \(=115\div\frac{23}{20}\)

           \(x\)                       \(=100\)

X+15%.x=115

X+3/20.x=115

X.(3/20+1)=115

X.23/20=115

X=115:23/20

X=100

Cho minh 1 dung nha

Ý bn là ⋮ đúng không?

Chia hết

\(⋮\)

\(\Leftrightarrow x+\frac{3}{20}x=115\)

\(\Rightarrow x\left(1+\frac{3}{20}\right)=115\)

\(\Rightarrow x\cdot\frac{23}{20}=115\)

\(\Rightarrow\frac{23x}{20}=115\Rightarrow115\cdot20=23x\)

=>2300=23x

=>x=2300:23

=>x=100

x(1+15%) = 115

x.23/20 = 115

x = 115 : 23/20 = 100