0.78×1.1( )0.78 6.2×0.99( )6.2
①3.12×0.5=×
②12.5×8.7×0.8=(×)×
③(2.5+0.6)×4=×+×
④4.1×1.5+5.9×1.5=(+)×
101×26.9-1.25×26.9×0.8=