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数学
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-2x^2-6x .和6x+x^2
人气:181 ℃ 时间:2020-04-07 16:21:05
解答
① - 2 x ² - 6 x
= - 2(x ² + 3 x)
= - 2(x ² + 3 x + (3 / 2)² ) + 2 × (3 / 2)²
= - 2 (x + 3 / 2)² + 2 × 9 / 4
= - 2(x + 3 / 2)² + 9 / 2
② 6 x + x ²
= (x ² + 6 x + 3 ² )- 3 ²
= (x + 3)² - 9
配方:配成 a ² ± 2 a b + b ² = (a ± b)²
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-2x^2-6x .6x+x^2
2x²-6x+_____=2(x-____)² 配方
解方程: (1)x2-6x+9=(5-2x)2; (2)2y2+8y-1=0(用配方法).
用公式法和因式分解法解x^2-6X+9=(5-2X)^2
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