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ab2 - 2ab = 306
=> 10 . ab + 2 - 200 - ab = 306
9ab - 198 = 306
9ab = 504
ab = 504 : 9
ab = 56
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\(\overline{2ab}+36=\overline{ab2}\)
\(\Rightarrow2\times100+\overline{ab}+36=\overline{ab}\times10+2\)
\(\Rightarrow2\times100+36=\overline{ab}\times9+2\)
\(\Rightarrow236=\overline{ab}\times9+2\)
\(\Rightarrow236-2=\overline{ab}\times9\)
\(\Rightarrow234=\overline{ab}\times9\)
\(\Rightarrow\overline{ab}=234\div9\)
\(\Rightarrow\overline{ab}=26\)
\(\text{Vậy : }\overline{ab}=26\)
\(\text{Học tốt !}\)
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1ab + 1 = ab2
100 + ab + 1 = ab x 10 + 2
101 + ab = ab x 10 + 2
=> 101 - 2 = ab x (10 - 1)
=> 99 = ab x 9
=> ab = 99 : 9
=> ab = 11
Vậy a = 1 ; b = 1
Ủng hộ mk nha !!! ^_^
1ab+1=ab2
\(\Rightarrow\)100+ab+1=ab x 10+2
\(\Rightarrow\)100+1-2=ab x 10-ab
\(\Rightarrow\)99=ab x (10-1)
\(\Rightarrow\)ab x 9=99
\(\Rightarrow\)ab=11
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Lần sau bạn nói rõ số nhé.
Ta có:
\(\overline{2ab}=\overline{ab2}+81\Leftrightarrow200+\overline{ab}=10\overline{ab}+2+81\)
\(\Leftrightarrow9\overline{ab}=200-83=117\Rightarrow\overline{ab}=117:9=13\)
Vậy a = 1 và b = 3
Ta có:
\(\overline{2ab}=\overline{ab2}+81\Leftrightarrow200+\overline{ab}=10\overline{ab}+2+81\)
\(\Leftrightarrow9\overline{ab}=200-83=117\Rightarrow\overline{ab}=117:9=13\)
Vậy a = 1 và b = 3