Question

下列计算是否正确,试说明理由

判断下列各式计算是否正确,并说明理由,(1) (y^4)=y^7
判断下列各式计算是否正确,并说明理由,(1) (y^4)=y^7 (2) a^3+a^3=a^6 (3) (-2)^4·2^3=2^7 (4) a·a^2·a^3=(a^2)^3

Answer 1

(1) (y^4)=y^7 不对
(2) a^3+a^3=a^6 不对a^3+a^3＝2*a*a*a, a^6 =a*a*a*a*a*a
(3) (-2)^4·2^3=2^7对
(4) a·a^2·a^3=(a^2)^3对