Объяснение:
1) 3m^{8}n² jeśli 3m^4n=-2 == > m^{4}n=-2/3
3m^{8}n²= 3m^{4}n * m^{4}n =-2*(-2/3)=4/3
OTBET:3
2) X^{7}*x^{5}=x^{(7+5)}=x^{12}
OTBET:2
3)x^{7}:x^{5}=x^{(7-5)}=x²
OTBET:2
4)(x³)^{6}*x^{4}:x^{18}=x^{18}*x^{4}:x^{18=x^{22+4-18)}=x^{4}
OTBET: 3
5) 8x³*y^{4}*(-0,5 x²y^{5})³=
=8x³y^{4}*(-1/8)*x^{6}y^{15}=
=-x^{9}y^{19}
OTBET: 2
