Đáp án:
Ta có:`1 +( -1/60) +19/120`
` =120/120 + (-2)/120 +19/120`
`=137/120 = 411 / 360`
`58/90 + 59/72 +(-1/60)`
`=232/360 + 295/360 + (-6)/360`
`= 527/360`
`=> 411/360 < x/36 + (-1)/60<527/360`
`=> 411/360 < (10.x)/360 < 527/360`
`=>411<10.x<527`
`=>411/10<x<527/10`
`=>41,1<x<52,7`
Vì x ∈ Z nên `x ∈{ 42;43;44;45;46;47;48;49;50;51;52}`
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