99.9+9.9+0.9+0.3===

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99.9+9.9+0.9+0.3===99.9+9.9+0.9+0.3===99.9+9.9+0.9+0.3===99.9+9.9+0.9+0.3=(100-0.1)+(10-0.1)+(1-0.1)

99.9+9.9+0.9+0.3===
99.9+9.9+0.9+0.3
=
=
=

99.9+9.9+0.9+0.3===
99.9+9.9+0.9+0.3
=(100-0.1)+(10-0.1)+(1-0.1)+0.3
=100+10+1-0.1-0.1-0.1+0.3
= 111

111

99.9+9.9+0.9+0.3
=0.3*3*111+0.3*3*11+0.3*3+0.3*1
=0.3*(333+33+3+1)
=0.3*370
=111

99.9+9.9+0.9+0.3
=(99.9+0.1)+(9.9+0.1)+(0.7+0.3)
=100+10+1
=111 把0.9拆成0.1+0.1+0.7