5xy-{2xy—[3xy的-（4xy-2xy）]} =5xy-{2xy-[3xy-2xy]} =5xy-{2xy-xy} =5xy-2xy+xy =6xy-2xy =6*2*1-2*4*1 =12-8 =4
5xy－﹛2xy－[3xy－﹙4xy－2xy﹚]﹜,x=2,3Q
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