1. `3+4+5-7`
`=7+5-7`
`=5`
2. `3.10^3+2.10^2+5.10`
`=300.10+20.10+5.10`
`=10.(300+20+5)`
`=10.325`
`=3250`
3. `[(5-2)^2.(5-2)^3].5`
`=3^2.3^3.5`
`=9.27.5`
`=9.3.9.5`
`=81.15`
`=1215`
4, `2^5+2.{10+2.[3.(6-3)-1]-1}+1`
`=32+2.{10+2.[3.3-1]-1}+1`
`=32+2.{10+2.8-1}+1`
`=32+2.(10+16-1)+1`
`=32+2.25+1`
`=32+50+1`
`=83`
Cho mk xin hay nhất please
Thank you
