Tìm x biết a x 10 x 9,9 30,25b x 100 x 0,99 5,25
Tìm x biết:
a)x :10 + x * 9,9 =30,25
b)x :100 + x * 0,99 = 5,25
tim x
x:10+2*9,9=30,25
x:100+x*0,99=5,25
a)X:10+2X9,9=30,25
X:10+2 =30,25:9,9=3,05
X:10 =3,05+2=5,05
X =5,05x10=50,5
x:10+x*9,9=30,25
x:100+x*0,99=5,25
15+15x5+15x3+15
Đố làm được đấy
x:10+x*9,9=30,25
x*0,1+x*9.9=30,25
x*(0,1+9,9)=30,25
x*10=30,25
x=30.25:10=3,025
x chia 100 cong x nhan 0,99 bang 5,25
\(x:100+x.0,99=5,25\)
\(\Leftrightarrow x.\frac{1}{100}+x.\frac{99}{100}=\frac{21}{4}\)
\(\Leftrightarrow x.\left(\frac{1}{100}+\frac{99}{100}\right)=\frac{21}{4}\)
\(\Leftrightarrow x.1=\frac{21}{4}\)
\(\Leftrightarrow x=\frac{21}{4}\)
Tìm x biết
X x 9,9 + X : 10 = 20,06
X x 100,01 - X : 100 = 35,5
a/ => x.9,9 + x . 1/10 = 20,06
=> x(9,9 + 1/10) = 20,06
=> x = 2,006
b/ => x.100,01 - x.1/100 = 35,5
=> x(100,01 - 1/100) = 35,5
=> x = 0,355
Tìm x, biết :
a) 3 ×x ×5 = 3,45
b) x ×9,9 + x : 10 = 20,06
a) \(3\times x\times5=3,45\)
\(\Rightarrow\left(3\times5\right)\times x=3,45\)
\(\Rightarrow15\times x=3,45\)
\(\Rightarrow x=3,45:15\)
\(\Rightarrow x=0,23\)
\(a,3\times x\times5=3,45\\ 15\times x=3,45\\ x=0,23\)
Tìm x : X x 0,99 + X : 100 = 200,06
\(x\) \(\times\) 0,99 + \(x\) : 100 = 200,06
\(x\) \(\times\) 0,99 + \(x\) \(\times\) 0,01 = 200,06
\(x\) \(\times\) (0,99 + 0,01) = 200,06
\(x\) \(\times\) 1 = 200,06
\(x\) = 200,06
x x 0,9+1/10=1/100+0,99
Tìm X biết X x 9,9 + X : 10 = 12,5
\(x\cdot9,9+x:10=12,5\)
\(x\cdot9,9+x\cdot\frac{1}{10}=12,5\)
\(x\cdot\left(9,9+\frac{1}{10}\right)=12,5\)
\(x\cdot\left(\frac{99}{10}+\frac{1}{10}\right)=12,5\)
\(x\cdot\frac{100}{10}=12,5\)
\(x\cdot10=12,5\)
\(x=12,5:10\)
\(x=1,25\)
Vậy x = 1,25