(-3a²)三次方·a三次方+(-4a)²a七次方-(5a三次方)三次方
问题描述：
(-3a²)三次方·a三次方+(-4a)²a七次方-(5a三次方)三次方
答
(-3a²)^3·a^3+(-4a)²*a^7-(5a^3)^3
=-27a^6*a^3+16a^*a^7-125a^9
=-27a^9+16a^9-125a^9
=-136a^9.