(1)1/(x+1)-x+1 (2)2/(a+1)-(a-2)/(a^2-1)÷(a^2-2a)/(a^2-2a+1) (3)20^2-20*38+19^2(1)1/(x+1)-x+1 (2)2/(a+1)-(a-2)/(a^2-1)÷(a^2-2a)/(a^2-2a+1)(3)20^2-20*38+19^2(4)899^2-101^2 (5)1/2* 3.7^2-3.7*2.7+1/2* 2.7^2
问题描述:
(1)1/(x+1)-x+1 (2)2/(a+1)-(a-2)/(a^2-1)÷(a^2-2a)/(a^2-2a+1) (3)20^2-20*38+19^2
(1)1/(x+1)-x+1 (2)2/(a+1)-(a-2)/(a^2-1)÷(a^2-2a)/(a^2-2a+1)
(3)20^2-20*38+19^2
(4)899^2-101^2 (5)1/2* 3.7^2-3.7*2.7+1/2* 2.7^2
答