50×5－2+25－1=____________．
25÷6=____________．
(－)6÷(－)3=____________．
(2) 2 (b) 3－(－2b) 3(－)=______________．
－52×(－5) 2×5－4=_____________．
0．258×643×258×48=______________．
25÷6=____________．
)6÷(－)3=____________．
2) 2 (b) 3－(－2b) 3(－)=______________．