合并同类项 ⊙ 2x-[2﹙x+3y﹚-3﹙x-2y﹚] ⊙ 2x-3y-1-2x+y ⊙ 5﹙2x-7y﹚-3﹙4x-
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/09 18:10:36
合并同类项 ⊙ 2x-[2﹙x+3y﹚-3﹙x-2y﹚] ⊙ 2x-3y-1-2x+y ⊙ 5﹙2x-7y﹚-3﹙4x-10y﹚
⊙3﹙3a²-2ab﹚-2﹙4a²-ab﹚
⊙3﹙3a²-2ab﹚-2﹙4a²-ab﹚
⊙ 2x-[2﹙x+3y﹚-3﹙x-2y﹚] =2x-(2x+6y-3x+6y)=2x-(12y-x)=2x+x-12y=3x-12y
⊙ 2x-3y-1-2x+y=-2y-1
⊙ 5﹙2x-7y﹚-3﹙4x-10y﹚=10x-35y-12x+30y=-2x-5y
⊙3﹙3a²-2ab﹚-2﹙4a²-ab﹚=9a²-2ab-8a²+ab=a²-a
⊙ 2x-3y-1-2x+y=-2y-1
⊙ 5﹙2x-7y﹚-3﹙4x-10y﹚=10x-35y-12x+30y=-2x-5y
⊙3﹙3a²-2ab﹚-2﹙4a²-ab﹚=9a²-2ab-8a²+ab=a²-a
合并同类项 ⊙ 2x-[2﹙x+3y﹚-3﹙x-2y﹚] ⊙ 2x-3y-1-2x+y ⊙ 5﹙2x-7y﹚-3﹙4x-
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