估算下面各题403×31 3240÷41.
(泰州)计算:(1)(2)[6.85﹣(0.65+0.7)]÷2.5(3).
(武进区)怎样算简便就怎样算.①②(1.5﹣0.6)×(3﹣1.8)③630÷[28×(19﹣4)]④⑤()×8+.
(建湖县)下面各题怎样简便就怎样算. (1)96× (2) (3) (4) (5) (6).
(姜堰市)解方程(1)x:1.2=3:4(2) x﹣=8.5(3)=0.5.
(苏州)计算下面各题,能简算的要简算. ①630÷18×24 ②0.7+3.9+4.3+6.1 ③16×+4× ④(7.5﹣7.5×0.6)÷4 ⑤(+÷3)× ⑥.