Cứuuuuuuuuuuuuuuuuuuuuuuu

`C1.`

`1/2xx45+0,5xx37+5/10xx18`

`=1/2xx45+1/2xx37+1/2x18`

`=1/2xx(45+37+18)`

`=1/2xx100`

`=50`

`C2.`

`1/2xx45+0,5xx37+5/10xx18`

`= 0,5 xx 45 + 0,5 xx 37 + 0,5 xx 18`

`=0,5xx (45 + 37 + 18)`

`=0,5 xx 100`

`=50`