=400+193-3
=593-3
=590
=645-(378+22)
=645-400
=245
①39×74+26×39
②504÷[104-(456-376)]
③436×99+436
④8×38×125
⑤594-12×18+236
⑥480+320÷(214-198)
①4.7﹣0.7×1.5﹣0.75
② ÷[( + )× ]
③25×4.9×4
④35×25×( )
⑤5600÷(7×25)
⑥13×(10+0.2)
①2021÷1.25÷
②5.74×12.5%+1.26÷8+
③(-0.6)÷(-)
④0.8÷[(+)×]