2 câu trả lời
`1)` Quy đồng `6/15; 13/8; 4/19`
Giải
Ta có:
`6/15=(6:3)/(15:3)=2/5`
→ `MSC: 760`
`6/15=2/5=(2.152)/(5.152)=304/760`
`13/8=(13.95)/(8.95)=1235/760`
`4/19=(4.40)/(19.40)=80/760`
6/15 = 6 x 8 x 19/15 x 8 x 19 = 912/2280
13/8 = 13 x 15 x 19/8 x 15 x 19 = 3705/2280
4/19 = 4 x 15 x 8/19 x 15 x 8 = 480/2280