Đáp án:

Giải thích các bước giải:

50=2.5250=2.52

75=3.5275=3.52

⇒BCN⇒BCNN(50,75)=2.3.52=150N(50,75)=2.3.52=150

⇒BC(50,75)=B(150)⇒BC(50,75)=B(150)

⇒BC(50,75)={0;150;300;450;...}⇒BC(50,75)={0;150;300;450;...}

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10=2.510=2.5

18=2.3218=2.32

90=2.32.590=2.32.5

⇒BCN⇒BCNN(10,18,90)=2.32.5=90N(10,18,90)=2.32.5=90

⇒BC(10,18,90)=B(90)⇒BC(10,18,90)=B(90)

⇒BC(10,18,90)={0;90;180;270;360;...}