合并同类项综合练习题29Word下载.docx
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合并同类项综合练习题29Word下载.docx
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3c-5c-9c2x+2e-4x-3e
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7a+7d+2a-6d-13a+12d2ab+7ab+16ab-ab
19x2y-2b2c+11x2y+9b2c4n-4n2-6n-9n2+8
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