(-a^4)^5-(-a²×a³)^4+(-a²)^10+a^4(-a²)^5×(-a²)³
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(-a^4)^5-(-a²×a³)^4+(-a²)^10+a^4(-a²)^5×(-a²)³
(-a^4)^5-(-a²×a³)^4+(-a²)^10+a^4(-a²)^5×(-a²)³
(-a^4)^5-(-a²×a³)^4+(-a²)^10+a^4(-a²)^5×(-a²)³
原式=-a^20-(a^5)^4+a^20+a^4(-a^10)(-a^6)
=-a^20-a^20+a^20+a^20
=0
=-a^20-a^20+a^20+a^20
=0
=-a^20-a^8*a^12+a^20+a^4*(-a^10)*(-a^6)=-a^20-a^20+a^20+a^20=0