①836-192÷8×16
②1.4÷(1.4+0.7)
③0.8×0.4×12.5×0.25
④ ÷6+ ÷20
⑤14×19×( + )
⑥ ÷[( + )÷ ]
①4.38-1.56+0.62-0.44
②0.4×270×2.5
③(40+1.25)×8
④(12.5-0.05)×8
⑤2.6×8.5+8.5×7.4
⑥9.9×6.9-6.9×3.9