先化简,然后再代入计算
题目是不是:
(a - 1/2b)【(a+1/2b)²-(a - 1/2b)²】(a²+1/2ab+1/4b²)-2b(a^4-1)
=【(a+1/2b)²-(a - 1/2b)²】(a - 1/2b)(a²+1/2ab+1/4b²)-2b(a^4-1)
=2ab[a^3-(1/8)b^3]-2b(a^4-1)
=-1/4b^3+2b
=-7/4
欢迎到阳江一中数学吧来问问题
先化简,然后再代入计算
题目是不是:
(a - 1/2b)【(a+1/2b)²-(a - 1/2b)²】(a²+1/2ab+1/4b²)-2b(a^4-1)
=【(a+1/2b)²-(a - 1/2b)²】(a - 1/2b)(a²+1/2ab+1/4b²)-2b(a^4-1)
=2ab[a^3-(1/8)b^3]-2b(a^4-1)
=-1/4b^3+2b
=-7/4
欢迎到阳江一中数学吧来问问题