Bài 3 : ??????
Bài 4 : ??????
Bài 5 :
`6%` = `3/50` = `0,06`
`9%` = `9/100` = `0,09`
`125%` = `5/4` = `1,25`
`15%` = `3/20` = `0,15`
Bài 6 :
`2,25` = `225%` = `9/4` = `2 1/4`
`2,5` = `250%` = `5/2` = `2 1/2`
`1,75` = `175%` = `7/4` = `1 3/4`
`1,6` = `160%` = `8/5` = `1 3/5`
Bài 7 :
`\text{34 cm}` = `\text{0,34 m}`
`\text{524 mm}` = `\text{0,524 m}`
`\text{70mm}` = `\text{0,07 m}`
`\text{93 dm}` = `\text{9,3 m}`