(1)计算: | - 2 | + ( - 1 ) 2 + ( - 5 ) 0 - 4 ;
(2)解方程组: x + 2 y = 9 , ① 3 x - 2 y = - 5 ⋅ ② .
计算: (1); (2).
计算:.
计算 (1) (2)
计算 (1) (2)-
如图所示,已知AB∥CD,AB=CD,BF=CE,求证:AE=DF.