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a) \(3\times x\times5=3,45\)
\(\Rightarrow\left(3\times5\right)\times x=3,45\)
\(\Rightarrow15\times x=3,45\)
\(\Rightarrow x=3,45:15\)
\(\Rightarrow x=0,23\)
\(a,3\times x\times5=3,45\\ 15\times x=3,45\\ x=0,23\)
x*3+x:5=6,4
x*3+x*(1/5)=6,4
x*[3+(1/5)]=6,4
x*3,2=6,4
x=6,4:3,2
x=2
a)x x1.5=3.3+5.7
x x1.5=9
x=9:1.5=6
b)x:(4+0.125)=9.9
x:4.125=9.9
x=9.9:4.125=2.4 mik nha
a, x . 9,9 + x : 10 = 12,5
\(x.\frac{99}{10}+x.\frac{1}{10}=\frac{25}{2}\)
\(x\left(\frac{99}{10}+\frac{1}{10}\right)=\frac{25}{2}\)
\(x.10=\frac{25}{2}\)
\(x=\frac{25}{2}:10=\frac{25}{2}.\frac{1}{10}=\frac{5}{4}\)
b, \(x:\frac{1}{4}-x=\frac{78}{5}\)
\(x.4-x=\frac{78}{5}\)
\(x\left(4-1\right)=\frac{78}{5}\)
\(x.3=\frac{78}{5}\)
\(x=\frac{78}{5}:3=\frac{78}{5}.\frac{1}{3}=\frac{26}{5}\)
c, \(x:\frac{1}{10}-x:4-x.\frac{3}{4}=\frac{9}{4}\)
\(=x.10-x.\frac{1}{4}-x.\frac{3}{4}=\frac{9}{4}\)
\(x\left(10-\frac{1}{4}-\frac{3}{4}\right)=\frac{9}{4}\)
\(x.9=\frac{9}{4}\)
\(x=\frac{9}{4}:9=\frac{9}{4}.\frac{1}{9}=\frac{1}{4}\)
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\(x\cdot9,9+x:10=12,5\)
\(x\cdot9,9+x\cdot\frac{1}{10}=12,5\)
\(x\cdot\left(9,9+\frac{1}{10}\right)=12,5\)
\(x\cdot\left(\frac{99}{10}+\frac{1}{10}\right)=12,5\)
\(x\cdot\frac{100}{10}=12,5\)
\(x\cdot10=12,5\)
\(x=12,5:10\)
\(x=1,25\)
Vậy x = 1,25
a)
4 , 5 × x = 11 , 06 + 2 , 44 4 , 5 × x = 13 , 5 x = 13 , 5 : 4 , 5 x = 3
b)
9 , 9 : x = 6 , 4 − 5 , 08 9 , 9 : x = 1 , 32 x = 9 , 9 : 1 , 32 x = 7 , 5