7.28+3.2÷2.5 6.1×3.6+3.6×3.9
9.8×25 1.25×0.7×0.8
32.4+2.5÷0.4
5.4×2.7+7.3×5.4
12.5×88
3.6÷[(8.1+1.9)×0.2]
①836-192÷8×16
②1.4÷(1.4+0.7)
③0.8×0.4×12.5×0.25
④ ÷6+ ÷20
⑤14×19×( + )
⑥ ÷[( + )÷ ]