12.5×57×8 8.3+1.8×3 900÷25÷0.4
0.47×3.5+0.53×3.5 1.2×101 25.2÷12+2.9
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2