①39.2÷(16.8×0.5+1.6)
②6.4÷(14.9-11.7)×6.8
③0.28×5.4+5.4×0.72
④0.25×8.1×4
⑤0.78x101
⑥[(5.13+4.87)-3.7]÷0.09
①836-192÷8×16
②1.4÷(1.4+0.7)
③0.8×0.4×12.5×0.25
④ ÷6+ ÷20
⑤14×19×( + )
⑥ ÷[( + )÷ ]