20.6--20% 0.65×80%+0.35× ×99+
46÷ 6.8-3.9×+2.8 ÷4+
0.375×5.8+×3.2- (15-14×)×
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2