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\(\overline{2ab}+36=\overline{ab2}\)
\(\Rightarrow2\times100+\overline{ab}+36=\overline{ab}\times10+2\)
\(\Rightarrow2\times100+36=\overline{ab}\times9+2\)
\(\Rightarrow236=\overline{ab}\times9+2\)
\(\Rightarrow236-2=\overline{ab}\times9\)
\(\Rightarrow234=\overline{ab}\times9\)
\(\Rightarrow\overline{ab}=234\div9\)
\(\Rightarrow\overline{ab}=26\)
\(\text{Vậy : }\overline{ab}=26\)
\(\text{Học tốt !}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
ab + 407 = ab2
=> ab + 407 = 10 x ab + 2
=> 10 x ab - ab = 407 - 2
=> 9 x ab = 405
=> ab = 405 : 9 = 45
ab + 407 = ab2
ab + 407 = ab . 10 + 2
407 - 2 = ab . 10 - ab
405 = ab . 9
=> ab = 405 : 9
=> ab = 45
![](https://rs.olm.vn/images/avt/0.png?1311)
số cuối b- 3 = 2 - > b = 5
số đầu 5 = a -> a = 5
a = b = 5 = 5
vậy ab = 55
(500+ab)-3=ab.10+2
497=ab.9+2(Cung bot 2 ve di ab)
ab.9=497-2
ab.9=495
Vay ab=dung nho k cho minh de ung ho minh nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(3ab+112=ab7\Leftrightarrow112=7ab-3ab=4ab\Leftrightarrow ab=\dfrac{112}{4}=28\)
vậy \(ab=28\)
b) \(5ab+51=ab2\Leftrightarrow51=2ab-5ab=-3ab\Leftrightarrow ab=\dfrac{51}{-3}=-17\)
vậy \(ab=-17\)
c) \(ab.aba=abab\Leftrightarrow ababa=abab\Leftrightarrow ababa-abab=0\)
\(\Leftrightarrow abab\left(a-1\right)=0\) \(\Leftrightarrow\left\{{}\begin{matrix}abab=0\\a-1=0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=1\\bb=0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=1\\b=0\end{matrix}\right.\)
vậy \(a=1;b=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2ab-a+b=3\)
\(4ab-2a+2b=6\)
\(2a\left(2b-1\right)+2b=6\)
\(2a\left(2b-1\right)+\left(2b-1\right)=7\)
\(\left(2a+1\right)\left(2b-1\right)=7\)
\(TH1:\left\{{}\begin{matrix}2a+1=1\\2b-1=7\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=0\\b=4\end{matrix}\right.\)
\(TH2:\left\{{}\begin{matrix}2a+1=7\\2b-1=1\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=3\\b=\dfrac{1}{2}\end{matrix}\right.\)
\(TH3:\left\{{}\begin{matrix}2a+1=-1\\2b-1=-7\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=-1\\b=-3\end{matrix}\right.\)
\(TH4:\left\{{}\begin{matrix}2a+1=-7\\2b-1=-1\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=-4\\b=0\end{matrix}\right.\)
Rồi em tự tính ab ra nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(-a - 2ab \)
= \(-a + ( -2ab ) \)
= \(-( a + 2ab ) \)
= \(-3ab\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ab2 - 2ab = 306
=> 10 . ab + 2 - 200 - ab = 306
9ab - 198 = 306
9ab = 504
ab = 504 : 9
ab = 56
ab2-2ab=306
=> 10.ab+2-200-ab=306
9ab-198=306
9ab=504
ab=504 :9
ab=56