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2.5×17.3×4
=（2.5×4）×17.3
=10×17.3
=173
4.5-4.5×0.1
=4.5-0.45
=4.05
5.6+2.4×0.1
=5.6+0.24
=5.84
3.75×4.4×0.5
=（3.75×4）×（1.1×0.5）
=15×0.55
=8.25
5.47+4.6+1.3
=10.7+1.3
=11.37
6.9×99+6.9
=6.9×（99+1）
=6.9×100
=690
10.2×0.25
=10×0.25+0.2×0.25
=2.5+0.05
=2.55
1.25×1.32×0.8
=（1.25×0.8）×1.32
=1×1.32
=1.32
0.25×3.2×1.25
=（0.25×4）×（0.8×1.25）
=1×1
=1
=（2.5×4）×17.3
=10×17.3
=173
4.5-4.5×0.1
=4.5-0.45
=4.05
5.6+2.4×0.1
=5.6+0.24
=5.84
3.75×4.4×0.5
=（3.75×4）×（1.1×0.5）
=15×0.55
=8.25
5.47+4.6+1.3
=10.7+1.3
=11.37
6.9×99+6.9
=6.9×（99+1）
=6.9×100
=690
10.2×0.25
=10×0.25+0.2×0.25
=2.5+0.05
=2.55
1.25×1.32×0.8
=（1.25×0.8）×1.32
=1×1.32
=1.32
0.25×3.2×1.25
=（0.25×4）×（0.8×1.25）
=1×1
=1
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