Question

determinati numarul abcd, stiind ca aaaa-aaa-aa-a=bcbd
dau coroana! repede va roggg. ​

Answer 1

Răspuns:

abcd = b( b + c ) ( c + a ) ( 2a + 2d )

Explicatie pas cu pas :

aaaa - aaa - aa - a = bcbd

1111a - 111a - 11a - a = bcbd

1000a - 12a = 1000b + 100c + 10b + d

988a = 1010b + 100c + d

abcd = 1000a + 100b + 10c + d

1000a = 1000b + 100c + 10b + d + 12a

abcd = 1000b + 100c + 10b + d + 12a + 100b + 10c + d = 1000b + 100( b + c ) + 10( c + a ) + 1( 2a + 2d )

Cu parantezele mai sus am notat o singura cifra