86.35+8.9×86.35+8.635×0.1×10
=86.35+8.9×86.35+8.635×10×0.1
=86.35+8.9×86.35+86.35×0.1
=86.35×(1+8.9+0.1)
=86.35×10
=863.5
5.99×280+59.9×520+599×2
=5.99×(28×10)+59.9×520+599×0.1×10×2
=59.9×28+59.9×520+59.9×20
=59.9×(28+520+20)
86.35+
8.9×86.35+
86.35×0.1 = 86.35*(1+8.9+0.1)=863.5
599×2.8+
599×52+
599×2 = 599*(2.8+52+2)=34023.2
86.35*（1+8.9+0.1)=86.5
59.9(28+520+20)=34023.2
五年级上册简便计算
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