6-(5-5847)+5-5847
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![](https://rs.olm.vn/images/avt/0.png?1311)
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4 = 2²
5 = 5
6 = 2.3
⇒ BCNN(4; 5; 6) = 2².3.5 = 60
⇒ x - 1 ∈ BC(4; 5; 6) = B(60) = {0; 60; 120; 180; 240; 300; 360; 420; ...}
⇒ x ∈ {1; 61; 121; 181; 241; 301; 361; 421; ...}
Mà x < 400
⇒ x ∈{1; 61; 121; 181; 241; 301; 361}
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
=-9+{-54:[256+7].4}
=-9+{-54: 263 .4}
=-9+ -216/263
=-2583/263
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\overline{ab}+\overline{ba}\\=a\cdot10+b+b\cdot10+a\\=10a+b+10b+a\\=(10a+a)+(10b+b)\\=11a+11b\\=11\cdot(a+b)\)
Vì \(11\cdot(a+b)\vdots11\)
nên \(\overline{ab}+\overline{ba}\vdots11\).
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(x+4⋮x\)
\(\Rightarrow\left(x+4\right)-x⋮x\)
\(\Rightarrow4⋮x\)
\(\Rightarrow x\in\left\{1;-1;2;-2;4;-4\right\}\)
b) \(\left(75-x\right)\left(x+32\right)\left(x-58\right)=0\)
\(\Rightarrow75-x=0;x+32=0;x-58=0\)
\(\Rightarrow x=75;x=-32;x=58\)
6 - (5 - 5847) + 5 - 5847
= 6 - 5 + 5847 + 5 - 5847
= 6 + (-5 + 5) + (5847 - 5847)
= 6