17.15-(3.5-2.85)简便运算
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17.15-(3.5-2.85)简便运算
17.15-(3.5-2.85)简便运算
17.15-(3.5-2.85)简便运算
17.15-(3.5-2.85)
=17.15+2.85-3.5
=20-3.5
=16.5
17.15-(3.5-2.85)
=17.15 + 2.85 -3.5
=20-3.5
=16.5