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含未知數的一次項:例如3X、2Y;不含未知數的一次項是指沒有這些項. 解方程組 3x2+xy+y2=15 3x2-31xy+5y2=-45 分析:這個方程組的兩個方程都不含未知數的一次項,消去常數項就可得到形如:ax2+bxy+cy2=0的方程.當判別式b2-4ac大於0時,該方程可通過分解因式來求x、y.
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