1 直接写出得数。(每题1分,共20分)
$0.7×0.6= $ $1÷0.125= $ $8.4-5.6= $ $9.8+0.2= $
$7.8+1.2= $ $6.75-3.64= $ $2.82+3.18= $ $18-12.5= $
$8.88-2.66= $ $2.8÷100= $ $123.1-75.8= $ $6.25-4.38= $
$6.89-2.18= $ $0.3×0.5= $ $1.6×0.25= $ $78×0.9= $
$157.3-112.6= $ $2.73+3.91= $ $1.89+2.41= $ $0.11×5= $

0.42 8 2.8 10
9 3.11 6 5.5
6.22 0.028 47.3 1.87
4.71 0.15 0.4 70.2
44.7 6.64 4.3 0.55

2 列竖式计算,带※的得数保留两位小数。(每题3分,共9分)
$0.54×1.35= $ $29.9÷0.46= $ $※48÷2.3≈$

竖式略
0.729 65 20.87

3 计算下列各题,能简算的要简算。(每题3分,共9分)
$6.42-0.42÷6$ $12.5×1.8×0.8$ $28.3×10.1-2.83$

6.35 18 283

4 解方程。(每题4分,共12分)
$4.3x+3.6x= 39.5$ $2x+1.5x= 16.1$ $1.3x+2.7x= 0.28$

解：$x=5$ 解：$x=4.6$ 解：$x=0.07$