`a)5.2^2-18:3^2`
`=20-9`
`=11`
`b)17.85+15.17-120`
`=17.(85+15)-120`
`=17.100-120`
`=1700-120`
`=1580`
`c)2^3. 17-2^3. 14`
`=2^3.(17-14)`
`=2^3. 3`
`=8.3`
`=24`
`d)27.75+25.27-150`
`=27.(75+25)-150`
`=27.100-150`
`=2700-150`
`=2550`
`e)160-(2^3. 5^2-6.25)`
`=160-[25.(8-6)]`
`=160-(25.2)`
`=160-50`
`=110`
`j)4.5^2-32:2^4`
`=100-2`
`=98`
`g)2^3-5^3. 5^2+12.2^2`
`=8-3125+48`
`=-3069`
`h)777:7+1331:11^3`
`=1+1331:1331`
`=1+1`
`=2`
`i)5871[928-(247-82.5)]`
`=5871[928-(247-410)]`
`=5871[928--163]`
`=5871.1091`
`=6405261`
`k)12:{400:[500-(125+25.7)]}`
`=12:{400:[500-(125+175)]}`
`=12:{400:[500-300]}`
`=12:{400:200}`
`=12:2`
`=6`
`l)[(7-3^3: 3^2):2^2+99]-100`
`=[(7-3):4+99]-100`
`=[4:4+99]-100`
`=100-100`
`=0`
`m)3^2[(5^2-3):11]-2^4+2-10^3`
`=9[22:11]-16+2-1000`
`=9.2-16+ -998`
`=-996`
