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例1判断:2x-9是方程。()错误解法:(√)错因分析:此算式虽然含有未知数,但它不是等式,更不是方程。正确解法:(×)
Example 1 Judgment: 2x-9 is an equation. () Error Solution: (√) Error Analysis: Although this formula contains an unknown number, but it is not an equation, not an equation. Correct solution: (×)