Đáp án + Giải thích các bước giải:
a)
`2/3x+(-1)/2x=(-5)/36`
`=>x[2/3+(-1)/2]=(-5)/36`
`=>1/6x=(-5)/36`
`=>x=(-5)/36:1/6`
`=>x=(-5)/6`
b)
`(2/5-x):1 1/3+1/2=-4`
`=>(2/5-x):4/3=-4-1/2`
`=>(2/5-x):4/3=(-9)/2`
`=>2/5-x=(-9)/2. 4/3`
`=>2/5-x=-6`
`=>x=2/5-(-6)`
`=>x=32/5`
c)
`4^x+4^(x+3)=4160`
`=>4^x .(1+4^3)=4160`
`=>4^x .65=4160`
`=>4^x=4160:65`
`=>4^x=64`
`=>x=3`
d)
`(x-100)/24+(x-98)/26+(x-96)/28=3`
`=>((x-100)/24-1)+((x-98)/26-1)+((x-96)/28-1)=3-1-1-1`
`=>(x-124)/24+(x-124)/26+(x-124)/28=0`
`=>(x-124).(1/24+1/26+1/28)=0`
`=>x-124=0` (vì `1/24+1/26+1/28\ne0`)
`=>x=124`
