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a) 46 874 – x = 1465
x = 46 874 – 1465
x = 45409
b) x - 1489 = 74 660
x = 74 660+1489
x = 76149
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a) x - \(\frac{1}{8}\)= \(\frac{7}{3}\)x \(\frac{21}{4}\)
x - \(\frac{1}{8}\)= \(\frac{49}{4}\)
x = \(\frac{49}{4}\)+ \(\frac{1}{8}\)
x = 98
b) x : \(\frac{3}{2}\) = \(\frac{1}{4}\)
x = \(\frac{1}{4}\)x \(\frac{3}{2}\)
x = \(\frac{3}{8}\)
c) \(\frac{103}{10}\) - x = \(\frac{4}{5}\)
x = \(\frac{103}{10}\)- \(\frac{4}{5}\)
x = \(\frac{19}{5}\)
d) x = 51 x \(\frac{4}{17}\)
x = \(12\)
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gọi 3 số lẻ liên tiếp là a;a+2;a+4(a lẻ)
vì tổng bằng 21 nên tacos a+(a+2)+(a+4)=21
=>a=5
vậy số thứ nhất ,thứ 2,3 lll 5;7;9
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x+8+5:2=10
x+8+2,5=10
x+8=10-2,5
x+8=7,5
x=7,5-8
x= -0,5
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\(x\times2+\frac{x}{2}=10\)
\(\Leftrightarrow x\times2+x\times\frac{1}{2}\)
\(\Leftrightarrow x\left(2+\frac{1}{2}\right)=10\)
\(\Leftrightarrow x\left(\frac{4}{2}+\frac{1}{2}\right)=10\)
\(\Leftrightarrow x\times\frac{5}{2}=10\)
\(\Leftrightarrow x=4\)
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\(x\cdot2+\frac{x}{2}=10\)
\(x\cdot\left(2+\frac{1}{2}\right)=10\)
\(x\cdot\frac{5}{2}=10\)
\(x=10:\frac{5}{2}\)
\(x=4\)
\(\times+\left(\times+1\right)+\cdot\cdot\cdot+\left(\times+10\right)=660\)
\(\Rightarrow11\times+\left(1+2+\cdot\cdot\cdot+10\right)=660\)
\(\Rightarrow11\times+55=660\)
\(\Rightarrow11\times=660-55\)
\(\Rightarrow11\times=605\)
\(\Rightarrow\times=55\)