Question

3. Tìm x biết: a)9. x=108 b)216-×=79 c)105-5. x =35 4.a)Tìm ƯCLN(60,72) b)BCNN(36,40)

Answer 1

\(a,9.x=108\)

\(x=108:9\)

\(x=12\)

\(b,216-x=79\)

\(x=216-79\)

\(x=137\)

\(c,105-5x=35\)

\(5x=105-35\)

\(5x=70\)

\(x=70:5\)

\(x=14\)

\(d,\) ƯC ( 60;72 ) = 1;2;3;4;6;12

=> ƯCLN(60;72) = 12

Answer 2

3.a)9.x=108

x=108:9

x=12

Vậy x=12

b)216-x=79

x=216-79

x=137

Vậy x=137

c)105-5.x=35

5.x=105-35

5.x=70

x=70:5

x=14

Vậy x=14

4.a,60=2².3.5

      72=2³.3²

=>ƯCLN(60;72)=2².3=12

b,36=2².3²

    40=2³.5

=>BCNN(36;40)=2³.5.3²=360