Đáp án+Giải thích các bước giải:
`+)` `2x^3-1=15`
`=>2x^3=16`
`=>x^3=8`
`=>x=2`
ta co : `(x+16)/9=(2+16)/9=18/9=2`
`+)(y-25)/16=2`
`=>y-25=16.2`
`=>y-25=32`
`=>y=32+25`
`=>y=57`
`+)(z+9)/25=2`
`=>z+9=25.2`
`=>z+9=50`
`=>z=50-9`
`=>z=41`
_________________________
`M=x+y+z`
`=>M=2+57+41`
`=>M=100`