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Phân tích bằng cấu tạo số, ta có:
\(\left(a\text{x}100+b\text{x}10+c\text{x}1\right)\text{ }+\left(a\text{x}10+b\text{x}1\right)+a\text{x}1=956\)
\(\Rightarrow\left(100a+10a+1a\right)+\left(10b+1b\right)+1c=956\)
\(\Rightarrow111a+11b+c=956\)
abc + ab + a = 114
\(\Rightarrow a\times111+b\times11+c=114\)
\(\Rightarrow a=1\)để \(a\times111+b\times11+c=114\) đúng \(\Rightarrow b\times11+c=3\)
\(\Rightarrow b=0,c=3\)
\(a\times100+b\times10+c+a\times10\)+ b+a=974
\(a\times111+b\times11+c=974\)
=>a=974:111=8 dư 86
b=86:11=7 dư 9
c=9:1=9
Vậy abc=879
Ta có : \(abc+ab+a=521\)
\(a.100+b.10+c+a.10+b+a=521\)
\(a.\left(100+10+1\right)+bx\left(10+1\right)+c=521\)
\(a.11+b.11\)
ta có
\(\overline{abc}+\overline{ab}+a=803\)
hay \(111a+11b+c=803\Rightarrow111a=803-11b-c>803-11\times9-9=695\)
\(\frac{\Rightarrow695}{111}< a< \frac{803}{111}\Rightarrow a=7\Rightarrow11b+c=26\Rightarrow11b=26-c>26-9=17\)
\(\frac{\Rightarrow17}{11}< b< \frac{26}{11}\Rightarrow b=2\Rightarrow c=4\Rightarrow\overline{abc}=724\)
\(\Rightarrow100xa+10xb+c+10xa+b+a=111xa+11xb+c\)
\(\Rightarrow111xa+11xb+c=927\)
+ Nếu \(a=9\)
\(\Rightarrow111xa+11xb++a=111x9+11xb+c=\)
\(=999+11xb+c>927\) => a=9 loại
+Nếu \(a=7\)
\(\Rightarrow111xa+11xb+c=111x7+11xb+c=\)
\(=777+11xb+c\)
Ta có \(b\le9;c\le9\Rightarrow11xb+c\le99+9=108\)
\(\Rightarrow777+11xb+c\le777+108=885< 927\) => a=7 loại
=> a=8
\(\Rightarrow111xa+11xb+c=111x8+11xb+c=927\)
\(\Rightarrow11xb+c=39\)
\(\Rightarrow11xb< 39\Rightarrow b\le3\)
Ta có
\(11xb=39-c\) do \(c\le9\Rightarrow11xb\ge39-9=30\Rightarrow b\ge3\)
=> b=3
\(\Rightarrow111xa+11xb+c=927\)
\(\Rightarrow111x8+11x3+c=927\Rightarrow c=6\)
Thử
\(836+83+8=927\)
\(\Rightarrow a=8;b=3;c=6\)