1. 直接写出得数。
6.7+2.3=
4-0.6=
0.54+0.9=
8.5-0.24-1.76=
9.8-0.5=
9.6×3=
6.2×0.5=
7.2-1.2+6.7=
5.8+2.6=
2.2×0.4=
6.54÷0.1=
1.5×0.2÷0.3=
7.5÷0.05=
4.8÷1.6=
10.1×30=
0.5+0.5×0.6=
1.8×0.1=
5.2÷1.3=
12÷0.12=
6.8-2.4÷3=
14×0.7=
0.5×16=
0.87÷0.3=
4.8÷0.2×0.5=
1.3÷6.5=
0.7÷1.4=
4÷0.25=
(6.3-0.14)÷0.7=
3.6×0.03=
8.1×9=
7.8÷1.3=
4.5×4×0.2=

9 3.4 1.44 6.5 9.3 28.8 3.1 12.7 8.4 0.88 65.4 1 150 3 303 0.8 0.18 4 100 6 9.8 8 2.9 12 0.2 0.5 16 8.8 0.108 72.9 6 3.6

2. 计算下面各题,能简算的要简算。
5.87×99
8.32×3.4+8.32×6.6
(8.1+2.32)×3.6-2.78
240÷1.6÷0.5
(15.5×6+6×8.5)÷8
2.3×[(3.35-2.66)÷0.3]

581.13 83.2 34.732 300 18 5.29

5.87×99
=5.87×(100-1)
=5.87×100-5.87×1
=587-5.87
=581.13
8.32×3.4+8.32×6.6
=8.32×(3.4+6.6)
=8.32×10
=83.2
(8.1+2.32)×3.6-2.78
=10.42×3.6-2.78
=37.512-2.78
=34.732
240÷1.6÷0.5
=240÷(1.6×0.5)
=240÷0.8
=300
(15.5×6+6×8.5)÷8
=6×(15.5+8.5)÷8
=6×24÷8
=144÷8
=18
2.3×[(3.35-2.66)÷0.3]
=2.3×[0.69÷0.3]
=2.3×2.3
=5.29

(1)小明在计算3.36减一个一位小数时,把被减数和减数的末位对齐了,算出的结果是3.09。正确的结果是()。
(2)小马虎在计算5.4×(□+2.5)时,错算成5.4×□+2.5,那么他得到的结果比正确结果少()。

（1）0.66（2）11

（1）3.36 - 3.09 = 0.27，一位小数应为2.7，3.36 - 2.7 = 0.66
（2）5.4×(□+2.5) = 5.4×□ + 5.4×2.5，5.4×2.5 - 2.5 = (5.4 - 1)×2.5 = 4.4×2.5 = 11