姓名 ______________________日期 ____________得分 ____ / 12求根公式练习求根公式 · 1–12用求根公式解方程;根不是精确值时,四舍五入到百分位。简单替换1.x2 + 11x + 24 = 0简单替换2.3x2 − 15x + 18 = 0简单替换3.2x2 − x − 3 = 0简单替换4.2x2 + 18x + 36 = 0简单替换5.x2 + x − 2 = 0简单替换6.3x2 − 3 = 0简单替换7.2x2 − 4x − 6 = 0简单替换8.x2 − 6x + 9 = 0简单替换9.2x2 − 7x − 4 = 0简单替换10.x2 − 6x − 16 = 0简单替换11.x2 + x − 30 = 0简单替换12.2x2 − 15x + 25 = 0答案 — 求根公式练习求根公式1.x = −3 或 x = −82.x = 3 或 x = 23.x = 32 或 x = −14.x = −3 或 x = −65.x = 1 或 x = −26.x = 1 或 x = −17.x = 3 或 x = −18.x = 39.x = 4 或 x = −1210.x = 8 或 x = −211.x = 5 或 x = −612.x = 5 或 x = 52由 Math Sheet Studio 制作 · mathsheetstudio.com — 免费可打印数学练习卷