(-5)^5x5^3×(-5)^7

问题描述:

(-5)^5x5^3×(-5)^7
同底数幂的乘法
还有一道:(b-a)^2·(a-b)

解(-5)^5x5^3×(-5)^7=[-(5)]^5x5^3×[-(5)]^7=(-1)(5)^5x5^3×(-1)(5)^7=(5)^5x5^3×(5)^7=5^(5+3+7)=5^(15)(b-a)^2·(a-b)=[-(a-b)]^2·(a-b)=(-1)^2(a-b)^2·(a-b)=(a-b)^2×(a-b)=(a-b)^3...