Можно пожалуйста по действиям.

1a) 5a * 7b = 35 ab б) 2x²y³ * (- 3xy⁴) = 2 * (- 3) * x²⁺¹ * y³⁺⁴ =- 6x³y⁷
2) (- 2a²b³c)⁶ = (- 2)⁶ * (a²)⁶ * (b³)⁶ * c⁶ =64 a¹² b¹⁸ c⁶
3)
1) $(2 \frac{1}{3} a ^{2} b) ^{2} =( \frac{7}{3}a ^{2} b) ^{2}= \frac{49}{9} *a ^{2*2} b ^{2}= \frac{49}{9} a ^{4}b ^{2}$
2) $(- 4ab ^{2}) ^{2} =16a ^{2} b ^{2*2} = 16a ^{2}b ^{4}$
3) $\frac{49}{9}a ^{4}b ^{2} *(- \frac{9}{49}a b^{2} c)*16 a^{2} b ^{2} =- \frac{49}{9}* \frac{9}{49} *16a ^{4+1+2} b ^{2+2+2} c=16a ^{7}b ^{6}c$