7a^3-6a^3b+3a^2b+3A^3+6a^3b-3A^2b-10A^3
=(7a^3+3A^3-10a^3)-(6a^3b-6A^3b)+(3a^2b-3a^2b)
=0-0+0
=0
所以无论a,b等于多少都没有关系,反正答案都是0
题目中给出的条件a=0.35,b=-0.28是多余的,小明的说法有道理.
7a^3-6a^3b+3a^2b+3A^3+6a^3b-3A^2b-10A^3
=(7a^3+3A^3-10a^3)-(6a^3b-6A^3b)+(3a^2b-3a^2b)
=0-0+0
=0
所以无论a,b等于多少都没有关系,反正答案都是0
题目中给出的条件a=0.35,b=-0.28是多余的,小明的说法有道理.