Объяснение:
1) 3a*0,5b*4c= 6abc
2) 7x*0,1y*2z= 1,4xyz
3) 3)-2 2/3m^4*9mn³=-8/3m^4 * 9mn³=-24m^5n³
4) -2 1/3m² *6mn³=-7/3m²*6mn³=-14m³n³
5) -3a²b^4*3a²b^5=-9a^4b^9
6) -4mn^5*5n²*m^4=-20m^5n^7
7) (-4a²b^6)³=-64a^6b^18
8) (-3m^7n²)^4=81m^28n^8
