x(x+2)(x-2)-(x-3)(x+3)方 化简求值,其中x=0.25

题目

x(x+2)(x-2)-(x-3)(x+3)方 化简求值,其中x=0.25

答案

x^2表示x的2次方
= x * (x^2 - 2^2)- (x^2 - 3^2)
= x * (x^2 - 4)- (x^2 - 9)
= 0.25 * (0.25^2 -4)-(0.25^2 - 9)
= 7.953125