Lời giải và đáp án:
`a,` `3sqrt16+8sqrt9-15sqrt64`
`=` `3sqrt(4^2)+8sqrt(3^2)-15sqrt(8^2)`
`=` `3.4+8.3-15.8`
`=` `12+24-120`
`=` `-84`
`b,` `2/3sqrt9-3/2sqrt36+19`
`=` `2/3sqrt(3^2)-3/2sqrt(6^2)+19`
`=` `2/3 .3-3/2 .6+19`
`=` `2-3.3+19`
`=` `2-9+19`
`=` `12`
`c,` `5sqrt(0,16)+3sqrt(0,04)`
`=` `5sqrt((0,4)^2)+3.sqrt((0,2)^2)`
`=` `5.0,4+3.0,2`
`=` `2+0,6`
`=` `2,6`