x+15%.x=115
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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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\(\frac{x+115}{15}+\frac{x+119}{19}=\frac{x+217}{117}+\frac{x+327}{227}\)
\(\Leftrightarrow\left(\frac{x+115}{15}-1\right)+\left(\frac{x+119}{19}-1\right)=\left(\frac{x+217}{117}-1\right)+\left(\frac{x+327}{227}-1\right)\)
\(\Leftrightarrow\frac{x+100}{15}+\frac{x+100}{19}=\frac{x+100}{117}+\frac{x+100}{227}\)
\(\Leftrightarrow\frac{x+100}{15}+\frac{x+100}{19}-\frac{x+100}{117}-\frac{x+100}{227}=0\)
\(\Leftrightarrow\left(x+100\right)\left(\frac{1}{15}+\frac{1}{19}-\frac{1}{117}-\frac{1}{227}\right)=0\)
\(\Leftrightarrow x+100=0\)
\(\Leftrightarrow x=-100\)
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tìm x , biết
a, x + 10 = 1500
x = 1500 - 10
x = 1490
b, x + 15 = 115
x = 115 - 15
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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\(\Leftrightarrow x+\frac{3}{20}x=115\)
\(\Rightarrow x\left(1+\frac{3}{20}\right)=115\)
\(\Rightarrow x\cdot\frac{23}{20}=115\)
\(\Rightarrow\frac{23x}{20}=115\Rightarrow115\cdot20=23x\)
=>2300=23x
=>x=2300:23
=>x=100
x+15%.x=115
1,15 x=115
=>x=100