a,bcd + ab,cd + abc,d + abcd = 222,771
a + 10a + 100a + 1000a + b + 10b + 100b + c + 10c + d + \(\frac{b}{10}+\frac{c}{10}+\frac{d}{10}+\frac{c}{100}+\frac{d}{100}+\frac{d}{1000}=222,771\)
1111a + 111b + 11c+ d + \(\frac{b}{10}\)+ \(\frac{11c}{100}\)+ \(\frac{111d}{1000}\)= 222,771
Đề có cái gì sai sai