Объяснение:
1) 2x*(x2+5x-4)=2x•x²+2x•5x-2x•4=2x³+10x²-8x
2)0.7x2a*(-12x+5a2-8)=0,7ax²•(-12x+5a²-8)
3)-1 1/5n2*(5/8n2-3/4n3)= -11/5n² • 5/8n²-11/5n²•(- 3/4n³)= -11n²•1/8n²+33/20n⁵= -11/8n⁴+ 33/20n⁵
Объяснение:
1) 2x*(x2+5x-4)=2x•x²+2x•5x-2x•4=2x³+10x²-8x
2)0.7x2a*(-12x+5a2-8)=0,7ax²•(-12x+5a²-8)
3)-1 1/5n2*(5/8n2-3/4n3)= -11/5n² • 5/8n²-11/5n²•(- 3/4n³)= -11n²•1/8n²+33/20n⁵= -11/8n⁴+ 33/20n⁵