Bài 2:
` a) ` ` 7/12 ` + ` 5/12 ` x ` 3/10 `
= ` 7/12 ` + ` 1/8 `
= ` 14/24 ` + ` 3/24 `
= ` 17/24 `
` b) ` ( ` 8/5 ` : ` 8/15 ` ) : ` 3/5 `
= ( ` 8/5 ` x ` 15/8 ` ) : ` 3/5 `
= ` 3 ` : ` 3/5 `
= ` 5 `
Bài 3:
` 6 ` : ` a/b ` = ` 1/2 `
` a/b ` = ` 6 ` : ` 1/2 `
` a/b ` = ` 12/1 `
` 2 ` + ` a/b ` = ` 16/5 `
` a/b ` = ` 16/5 ` - ` 2 `
` a/b ` = ` 16/5 `
` a/b ` + ` 3 1/7 ` = ` 4 `
` a/b ` + ` 22/7 ` = 4
` a/b ` = ` 4 `+ ` 22/7 `
` a/b ` = ` 50/7 `
Chúc bạn học tốt!
