1.
16=2⁴
16=(1/2)⁻⁴
16=4²
16=(1/4)⁻²
2.[(3³×x⁻¹y⁻²)/(54x⁻²y)]⁻¹=[(3³x⁻¹y⁻²)/(3³×2×x⁻²y)]⁻¹=
=[(1/x×1/y²)/(2×1/x² ×y)]⁻¹=
=[(1/(xy²)/(2y/x²)]⁻¹=
=[(2y/x²)/(1/(xy²)]=
=(2y/x²)×(xy²)=2y³/x deci F
4.√(68²-32²)=√(68-32)(68+32)=√36×100=6×10=60
5a
√45+√61 1/4 -11√1 1/4 =
=3√5+√245/4 -11√5/4 =
=3√5+1/2 ×7√5 -1/2 ×11√5 =
=√5(3+7/2 -11/2) =
=√5(3-4/2) =
=√5(3-2) =√5
