`1) [(-2).2+7.(-10)]:2+9`
`=[-4+ -70]:2+9`
`=-74:2+9`
`=-28`
`2)2019-[157-(357-1019)]`
`=2019-[157+ -662]`
`=2019+505`
`=2524`
`3)(1173-3978)-(173-2978)`
`=-2805+2805`
`=0`
`4)-113.234+129.113-113.(-105)`
`=-26442+14577-11865`
`=-23720`
`5)(2020-3257)-(2019-3255)`
`=-1237+1236`
`=-1`