3.72×3.5+6.28×3.51
＝3.72×3.5+6.28×
3.5+6.28×0.01
＝3.5（3.72+6.28）+6.28×0.01
＝3.5×10+6.28
×0.01＝35+0.0628
＝35.0628
3.72×3.5+6.28×3.51
=3.72×3.5+6.28×（3.5+0.01）
=3.72×3.5+6.28×3.5+6.28×0.01
=（3.72+6.28）×3.5+0.0628
=10×3.5+0.0628
=35+0.0628
=35.0628
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