aaabbb = a00b.111
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![](https://rs.olm.vn/images/avt/0.png?1311)
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1.
\(\overline{aabb}=11\overline{a0b}\)
\(\Rightarrow1100a+11b=11\left(100a+b\right)\)
\(\Rightarrow1100a+11b=1100a+11b\)
\(\RightarrowĐCPM\)
2.
\(\overline{aaabbb}=111\overline{a00b}\)
\(\Rightarrow111000a+11b=111\left(100a+b\right)\)
\(\Rightarrow111000a+11b=111000a+11b\)
\(\RightarrowĐPCM\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)Ta có: Xét vế trái :
ab.101 <=> ab.(100+1) => ab.100+ab.1
=> ab00+ab=abab=Vế phải (đpcm)
b)Ta có Xét vế phải:
a00b.111=a00b.(100+10+1)=a00b00+a00b0+a00b
= aaabbb=Vế Phải(đpcm)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, abab = 101ab
Ta có: ab.101 = ab . ( 100 + 1 ) = ab00 + ab = abab
b, aaabbb = a00b . 111
Ta có: a00b.111 = a00b . 100 + a00b . 10 + a00b = a00b00 + a00b0 + a00b = aa0bb0 + a00b = aaabbb
a) ab.101=ab.(100+1)=ab.100+ab=(10a+b).100+10a+b=1000a+100b+10a+b=abab
b) a00b.111=a00b.(100+1)=a00b.100+a00b.10+a00b=a00b00+a00b0+a00b=aa00bb0=a00b=aaabbb
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{aaabbb}{a00b}\)
\(=\frac{111000a+111b}{1000a+b}\)
\(=\frac{111\left(1000a+b\right)}{1000a+b}\)
\(=111\)