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`#ZiiZii<3 `

`b)5^(x+1)-5^x=100.25^29 `

`<=>5^x  .5^1-5^x=4.25.25^29 `

`<=>5^x(5-1)=4.25^30 `

`<=>5^x  .4=4.25^30 `

`<=>5^x=4:4.25^30 `

`<=>5^x=1.25^30 `

`<=>5^x=25^30=(5^2)^30 `
`<=>5^x=5^60 `

`<=>x=60 `

`=> ` Vậy `x=60 `

`c)11^(2x-7)=11^11 `

`<=>2x-7=11 `

`<=>2x=11+7 `

`<=>2x=18 `

`<=>x=9 `

`=>` Vậy `x=9 `

`d)2^(2x+1)=2^7 `

`<=>2x+1=7 `

`<=>2x=7-1 `

`<=>2x=6 `

`<=>x=3 `

`=> ` Vậy `x=3 `

`e)(3x-1)^4=81 `

`<=>(3x-1)^4=3^4 `

`<=>3x-1=3 `

`<=>3x=3+1 `

`<=>3x=4 `

`<=>x=4/3 `

`=> ` Vậy `x=4/3 `

`g)(x+1)^5=-32 `
`<=>(x+1)^5=(-2)^5 `

`<=>x+1=-2 `

`<=>x=(-2)-1 `

`<=>x=-3 `
`=> ` Vậy `x=-3 `

`h)(2x-3)^4=5^4 `
`<=>2x-3=5 `

`<=>2x=5+3 `

`<=>2x=8 `

`<=>x=4 `
`=> ` Vậy `x=4 `

`i)(2x-3)^3=-64 `
`<=>(2x-3)^3=(-4)^3 `

`<=>2x-3=-4 `

`<=>2x=(-4)+3 `

`<=>2x=-1 `

`<=>x=(-1)/2 `

`=> ` Vậy `x=(-1)/2 `