拓展_去括号.ppt,填写适当的项: (1)a-b+c-d =a+( ); (2)a-b-c+d =a-(); (3)a-b-c+d =a+( )+ d; (4)a-b+c-d =a-b+( ). -b+c-db+c-d-b-c-c+d ?有错误的,应当怎样改正? )32(32)1(nmbanmba???????)2(2)2(banmbanm???????)4()2(42)3(ybaxybax???????)12(12)4(????????cbacba (×) (√) (×) (×) )32(nmba????)2(banm?????)12(??????cba x 3-x 2y-xy 2-y 3的值,按下面的要求把它的后两项用括号括起来. (1)括号前带有“+”号; (2)括号前带有“-”号; )( 32 23yxy yxx????)( 32 23yxy yxx???
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