七年级上册数学整式的加减法
①.2x�0�5-|-3x�0�5-[4x�0�5-(3x�0ÿ...
①.2x�0�5-|-3x�0�5-[4x�0�5-(3x�0�5-x)+(x-x�0�5)]|
②.-|-[-(-a�0�5)-b�0�5]|-[-(-b)�0�5] 展开
②.-|-[-(-a�0�5)-b�0�5]|-[-(-b)�0�5] 展开
2个回答
2013-09-13
展开全部
①2x�0�5.-|-3x�0�5-[4x�0�5-(3x�0�5-x)+(x-x�0�5)]|
=2x�0�5-|-3x�0�5-[4x�0�5-3x�0�5+x+x-x�0�5)]|
=2x�0�5-|-3x�0�5-[2x]|
=2x�0�5-|-(3x�0�5+2x)|
=2x�0�5-(3x�0�5+2x)
=-x�0�5-2x
=2x�0�5-|-3x�0�5-[4x�0�5-3x�0�5+x+x-x�0�5)]|
=2x�0�5-|-3x�0�5-[2x]|
=2x�0�5-|-(3x�0�5+2x)|
=2x�0�5-(3x�0�5+2x)
=-x�0�5-2x
2013-09-13
展开全部
②.-|-[-(-a�0�5)-b�0�5]|-[-(-b)�0�5]
=-|-[a�0�5-b�0�5]|-[-b�0�5]
=-(a�0�5-b�0�5)+b�0�5
=2b�0�5-a�0�5
=-|-[a�0�5-b�0�5]|-[-b�0�5]
=-(a�0�5-b�0�5)+b�0�5
=2b�0�5-a�0�5
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