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\(\frac{2}{3}\) \(-\) \(\left(\frac{1}{6}+\frac{1}{8}\right)\)
\(=\) \(\frac{2}{3}\) \(-\) \(\frac{7}{24}\)
\(=\) \(\frac{16}{24}\) \(-\) \(\frac{7}{24}\)
\(=\) \(\frac{9}{24}\)
\(=\)\(\frac{3}{8}\)
\(Học\) \(tốt!\)
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Gọi số cần tìm là ab. Ta có:
ab = 9(a + b)
\(\Rightarrow\)10a + b = 9a + 9b
\(\Rightarrow\)a = 8b.
\(\Rightarrow\)a : 8 = b.
Vì 0 < a < 10 và a \(⋮\)8 nên a = 8. Vậy b = 1.
Vậy số cần tìm là 81.
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Để x765y chia hết 5 =) y = 0,5
TH1 : y=0 =) x765y = x7650
Mà để x7650 chia hết 3 =) x+7+6+5+0 chia hết 3
=) 18 + x chia hết 3 =) x = 0,3,6,9 ( Vì x<0 )
Vậy với y =0 thì x = 0,3,6,9 ...
TH2 : tương tự Nếu y=5
- Quên mất , TH1 : Loại x = 0 vì x765y là số 5 chữ số ( mà nếu x = 0 =) sẽ = 0765y có 4 chữ số )
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a)36,4x99+36+0,4
=36,4x99+36,4x1
=36,4x(99+1)=36,4x100
=3640
b)77,28x20,2+23,72x20,2-20,2
=20,2x(77,28+23,72-1)
=20,2x100
=2020
a)36,4 x 99 + 36 + 0,4
=36,4 x 99 +36,4
=36.4 x ( 99+1 )
=36,4 x 100 = 3640
20000000000000456835555555
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999949999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999949999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999