3x³-3y³+5x²-5y²=
=3(x-y)(x²+xy+y²)+5(x-y)(x+y)=
=(x-y)(3(x²+xy+y²)+5(x+y))
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.
121-(11-9x)²=121-(121-198х+81х²)=121-121+198х-81х²=198х-81х²=9х(22-9х)