Question

1) abcd = a.10 mũ 3 + b. 10 mũ 2 + c. 10 mũ 7 + 10 mũ 3

Answer 1

=>1000a+100b+10c+d=1000a+100b+10000000c+1000

=>\(\left(a,b,c,d\right)\in\varnothing\)