Question

 

Giải giúp mình 2 baì này với

Answer 1

a)\(x\in B\left(13\right)=\left\{0;13;26;39,52,65;.78;91......\right\}\)

Mà `20<x<90`

nên \(x\in\left\{26;39;65;78\right\}\)

b)\(x\in B\left(10\right)=\left\{0;10;20;30;40;50;60;70......\right\}\)

mà `12<x<72`

nên \(x\in\left\{20;30;40;50;60;70\right\}\)

c)\(x\in B\left(20\right)=\left\{0;20;40;60;80;100....\right\}\)

mà `45<x<100`

nên\(x\in\left\{60;80\right\}\)

Answer 2

b1/

a/x=26,39,52,65,78

b/x=20,30,40,50,60,70

c/x=60,80

Answer 3

b2

a/x=1,2,3,6

b/x=1,5,7

c/x=5