1. 直接写出得数。
185 + 99 = 7.2×0.2 = 2.4×5 =
12.5×0.5 = 100÷25 = 0.7÷10 =
4.96×10 = 0.66 + 0.34 = 47.6×0.5 =
1.36 - 0.58 = 10.71 - 9.85 = 5.4 - 0.9 =
2.73 - 0.34 = 6.81 - 5.19 = 7 - 4.36 =
8.65 - 5 = 4.15 - 3 = 7.68 - 1.89 =

185 + 99 = 284
7.2×0.2 = 1.44
2.4×5 = 12
12.5×0.5 = 6.25
100÷25 = 4
0.7÷10 = 0.07
4.96×10 = 49.6
0.66 + 0.34 = 1
47.6×0.5 = 23.8
1.36 - 0.58 = 0.78
10.71 - 9.85 = 0.86
5.4 - 0.9 = 4.5
2.73 - 0.34 = 2.39
6.81 - 5.19 = 1.62
7 - 4.36 = 2.64
8.65 - 5 = 3.65
4.15 - 3 = 1.15
7.68 - 1.89 = 5.79

2. 计算下列各题，能简算的要简算。
0.56×3.2 + 0.44×3.2 1.25×1.7×0.8
4.8×0.2 + 0.2×4.8 0.8×(12.5 + 1.25)
2.8 + 5.4 + 7.2 + 3.6 9.75×0.5 + 4.25×0.5
2.5×3.2×1.25 75.3×99 + 75.3
23.46 - 6.57 - 3.43 0.625×8.3 - 0.3×0.625

0.56×3.2 + 0.44×3.2
=(0.56+0.44)×3.2
=1×3.2
=3.2
1.25×1.7×0.8
=1.25×0.8×1.7
=1×1.7
=1.7
4.8×0.2 + 0.2×4.8
=(4.8+4.8)×0.2
=9.6×0.2
=1.92
0.8×(12.5 + 1.25)
=0.8×12.5 + 0.8×1.25
=10 + 1
=11
2.8 + 5.4 + 7.2 + 3.6
=(2.8+7.2)+(5.4+3.6)
=10+9
=19
9.75×0.5 + 4.25×0.5
=(9.75+4.25)×0.5
=14×0.5
=7
2.5×3.2×1.25
=2.5×(0.4×8)×1.25
=(2.5×0.4)×(8×1.25)
=1×10
=10
75.3×99 + 75.3
=75.3×(99+1)
=75.3×100
=7530
23.46 - 6.57 - 3.43
=23.46-(6.57+3.43)
=23.46-10
=13.46
0.625×8.3 - 0.3×0.625
=0.625×(8.3-0.3)
=0.625×8
=5