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x=1時,2x²;+5x+c=10,通過該已知條件,可以求出c的數值.即:將x=1代入到方程之中2+5+c=10,可知:c=3.將c=3再代回原等式,可得:2x²;+5x+c變為:2x²;+5x+3當x=-2時代數式2x²;+5x+3的值為:2(-2)²;…
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