计算．
①7.5×1.8÷0.15 ②12.4÷0.8﹣9.64 ③7.65×2.4+1.64
④12.3﹣10.8÷4.5 ⑤44.28÷4.1÷0.9+2.5 ⑥39.87×4.58﹣29.87×4.58．
直接写得数．
0.6×0.7= 1.1×0.7= 1﹣0.25= 3.26÷100= 1.2÷3=
2.8．+1.2= 2.5×0.4= 1.72﹣1.2= 9.7×100= 2÷0.4=
直接写出得数．
1﹣0.25= 3.4+1.6= 4.3﹣0.8= 2.7+8.4= 14×0.2=
0.5×0.3= 0.25×4= 4.9×1000= 5×0.08= 1.5×4=
直接写得数，涂改不计分．
0.1÷0.01= 0.35×100= 2.5×4= 1.44÷1.2=
0.5×64= 15×0.06= 0÷0.24= 0.36×1=
2.5×5= 10+0.4= 2.5×0.4= 7.1×0.2= 1÷0.1= 3.6÷0.4=
0.2×3.1= 4.4﹣1.1= 10+3.4= 1﹣0.87= 6.3×2= 1.25×80=
0.2×0.3= 4.8÷1.2= 2.5×0.4= 8×12.5= 7÷3.5= 36÷0.4=
用竖式计算
1.688×32 （得数保留两位小数）
0.77×0.35（得数保留三位小数）
29.9÷0.46
2.6×0.25．