x-1/x=21*21/22
问题描述:
x-1/x=21*21/22
答
x-1/x=21×21/22=22-1/22
∴ x=22
或:x=1/22
x-1/x=21*21/22
x-1/x=21×21/22=22-1/22
∴ x=22
或:x=1/22