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0.25×4.78
=0.25×（4+0.78）
=0.25×4+0.25×0.78
=1+0.195
=1.195
3.4×9＋3.4
=3.4×（9+1)
=3.4×10
=34
2.7×4.3＋2.7×5.7
=2.7×（4.3+5.7）
=2.7×10
=27
1.25×11×0.8
=1.25×0.8×11
=1×11
=11
4.6×102
=4.6×（100+2）
=4.6×100+4.6×2
=460+9.2
=469.2
0.25×4.78×4
=0.25×4×4.78
=1×4.78
=4.78
=0.25×（4+0.78）
=0.25×4+0.25×0.78
=1+0.195
=1.195
3.4×9＋3.4
=3.4×（9+1)
=3.4×10
=34
2.7×4.3＋2.7×5.7
=2.7×（4.3+5.7）
=2.7×10
=27
1.25×11×0.8
=1.25×0.8×11
=1×11
=11
4.6×102
=4.6×（100+2）
=4.6×100+4.6×2
=460+9.2
=469.2
0.25×4.78×4
=0.25×4×4.78
=1×4.78
=4.78
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