①328-165-35
②216+188+84
③306-197
④40×(145-115)
⑤355÷(103-98)
⑥246+38-46
3.57+1.43= 4.2× =
10-9.2= 0.6×0.6=
0.72÷0.8= 8× ÷8÷ =