求下列各式中的x:(1) x²-7=0 (2)3(x-5)³=-375 (3) 9(x-3)²=64
问题描述:
求下列各式中的x:(1) x²-7=0 (2)3(x-5)³=-375 (3) 9(x-3)²=64
答
(1)x=7 (2)(x-5)³=-125 (3)(x-3)²=64/9x1=√7,x2=-√7 x-5=-5 x-3=+-8/3 ...