Question

1.计算:[(-1/2)x^2·y^3]·2^4·x^5·y^5= 2.若5x·[x^(n-1)+3]=5x^n-9,求

Answer 1

1.计算:[(-1/2)x^2·y^3]·2^4·x^5·y^5

=-8x^7·y^8

2.若5x·[x^(n-1)+3]=5x^n-9,求x的值.

若5x·[x^(n-1)+3]=5x^n-9,那么：

5x^n +15x=5x^n-9

则可得：15x=9

解得：x=3/5