47.1x0.3 +4.2x4.71+ 0.471x28的简便计算
47.1x0.3+4.2x4.71+0.471x28
=47.1x0.3+0.42x47.1+47.1x0.28
=47.1x(0.3+0.42+0.28)
=47.1x1
=47.1
47.1×0.3+4.2×4.71+0.471×28
＝4.71×3+4.2×4.71+4.71×2.8
＝4.71×（3+4.2+2.8）
＝4.71×10
＝47.1
47.1x0.3+4.2x4.71
+0.471x28
=47.1x0.3+0.42x47.1+47.1x0.28
=47.1x（0.3+0.42+0.28）
=47.1x1
=47.1
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