1)tinh ti so phan tram cua hai so
8va40;40va8;9,25va25
2)tinh ti so phan tram cua 2 so(theo mau)
Mau 19::30=0,6333...=63,33%
17va18;62va17;16va24
3)lop5bco 32 hoc sinh trong do co 24 hoc sinh thich tap boi hoi so hoc sinh thich tap boi chiem bao nhieu pham tram so hoc sinh cua lop 5b