Đáp án:
`(1/3)^{50}*(-9)^{25}-2/3:4`
`=(1/3)^{50}*(-1)*(3^2)^{25}-2/3*1/4`
`=-(1/3)^{50}*3^{50}-1/6`
`=-(1/3*3)^{50}-1/6`
`=-1-1/6`
`=-7/6`
`30)(10^{2}.5^{3})/(8,25^2)`
`=(2^{2}.5^{2}.5^3)/(2^{3}.5^{6})`
`=(2^{2}.5^{5})/(2^{3}.5^{6})`
`=1/(2.5)=1/10`
`31)(2^{10}.9^{41}.25^{3})/(3^{50}.15^{35}.10^9)`
`=(2^{10}.3^{82}.5^{6})/(3^{50}.5^{35}.3^{35}.2^{9}.5^9)`
`=(2^{10}.3^{82}.5^6)/(3^{85}.5^{44}.2^9)`
`=2/(5^{38}.3^3)`
`32)(2^{4}.2^{6})/((2^5)^2)-(2^{5}.15^{3})/(6^{3}.10^2)`
`=(2^{10})/(2^10)-(2^{5}.5^{3}.3^3)/(2^{3}.3^{3}.2^{2}.5^{2})`
`=1-(2^{5}.5^{3}.3^3)/(2^{5}.5^{2}.3^3)`
`=1-5=-4`
