Question

Tìm số tự nhiên a,b biết rằng:
a.b = 864 và ƯCLN (a,b) = 6

Answer 1

ƯCLN(a,b)=6

=>\(a=6k;b=6h\)

a*b=864

=>\(6k\cdot6h=864\)

=>\(k\cdot h=24\)

=>\(\left(k;h\right)\in\left\{\left(1;24\right);\left(2;12\right);\left(3;8\right);\left(4;6\right);\left(6;4\right);\left(8;3\right);\left(12;2\right);\left(24;1\right)\right\}\)

=>\(\left(a,b\right)\in\left\{\left(6;144\right);\left(12;72\right);\left(18;48\right);\left(24;36\right);\left(36;24\right);\left(48;18\right);\left(72;12\right);\left(144;6\right)\right\}\)