Question

determinati cifra x. pentru care are loc : 44x + 4x4+x44=1221

Answer 1

44x+4x4+x44=1221

(4×100+4×10+x)+(4×100+x×10+4)+(100×x+4×10+4)=1221

(400+40+x)+(400+10x+4)+(100x+40+4)=1221

(400+40+400+4+40+4)+(x+10x+100x)=1221

888+111x=1221

111x=1221-888

111x=333

x=333:111

x=3