计算: - 2 × - 27 3 + | 1 - 3 | - ( 1 2 ) - 2
11+192+193+19994+199995=
=
解下列方程或比例(每题3分,共12分) (1):=:x (2)= (3)2x﹣=0.5 (4)x+x=