小数的简算分配律的4道

解：
例如：
1.25x4
=（1+0.25）x4
=1x4+0.25x4
=4+1
=5
1.5x2
=（1+0.5）x2
=1x2+0.5x2
=2+1
=3
2.05x20
=（2+0.05）x20
=2x20+0.05x20
=40x1
=41
2.125x8
=（2+0.125）x8
=2x8+0.125x8
=16+1
=17

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