1. (1,2ab²)²=1,44a²b⁴
2. 0,7a*0,8ab⁴=0,56a²b⁴
3. 1,44a²b⁴+0,56a²b⁴=2a²b⁴
4. 2¹/₃a*9b-1,9ab*10=(7/3)*a*9b-19ab=21ab-19ab=2ab
5. (2a²b⁴)/(2ab)=ab³.
1. ((-1/8)xy)³=(-xy/8)³=(-3*2/8)³=-27/64
2. ((1/9)*xz²)²=x²z⁴/9²=(xz²/9)²=(3*(-1)²/9)²=1/9
3. -2,5y²z==-2,5*2²*(-1)=10
4. 2x=2*3=6
5. 6*(-27/64)*10*(1/9)=60*(-3/64)=-45/16.