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determina cifrelea,b,c si d din urmatoarele cazuri: abcd+bcd+cd+d=2740

Răspuns :

abcd+bcd+cd+d=2740

1000a+100b+10c+d+100b+10c+d+10c+d+d=2740

1000a+200b+30c+4d=2740

2(500a+100b+15c+2d)=2740

500a+100b+15c+2d=1370

500a+15c+100b+2d=1370

5(100a+3c)+2(50b+d)=1370