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x+15%.x=115
x+3/20.x=115
x.(1+3/20)=115
x.23/20=115
=>x=115:23/20
x=100
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x+15%.x=115
x(1+15%)=115
x.\(\frac{23}{20}\)=115
x=115:\(\frac{23}{20}\)
x=100
Nhớ cho đúng nha:
\(x+15\%\times x=115\)
\(x+\frac{15}{100}\times x=115\)
\(x\times\left(1+\frac{3}{20}\right)\)\(=115\)
\(x\times\frac{23}{20}\) \(=115\)
\(x\) \(=115\div\frac{23}{20}\)
\(x\) \(=100\)
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=> x + 3/20x = 115
=> x ( 3/20+1) = 115
=> x 23/20 = 115
=> x=115:23/20
=> x = 100
=>x+1/6.x=115
x.(1+3/20)=115
x.23/20=115
x=115:23/20
x=115.20/23
x=100
k nha:)
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\(\Leftrightarrow x+\frac{3}{20}x=115\)
\(\Rightarrow x\left(1+\frac{3}{20}\right)=115\)
\(\Rightarrow x\cdot\frac{23}{20}=115\)
\(\Rightarrow\frac{23x}{20}=115\Rightarrow115\cdot20=23x\)
=>2300=23x
=>x=2300:23
=>x=100
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115 - 15 (x-17)= 100
15 (x-17)= 115 - 100
15 (x-17) = 15
(x-17)=15 : 15
(x-17) = 1
x = 1+17
x= 18
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x + 15%.x = 115
x(100% + 15%)=115
x.115% = 115
x = 115 : 115%
x = 100
x+15%.x=115
1,15 x=115
=>x=100