①1800÷[(15+10)×3]
②15+75÷3
③212×4+188×4
④32×125
⑤19.92+14.4-9.92
⑥34.78-5.43-4.57
①836-192÷8×16
②1.4÷(1.4+0.7)
③0.8×0.4×12.5×0.25
④ ÷6+ ÷20
⑤14×19×( + )
⑥ ÷[( + )÷ ]
①4.7﹣0.7×1.5﹣0.75
② ÷[( + )× ]
③25×4.9×4
④35×25×( )
⑤5600÷(7×25)
⑥13×(10+0.2)