2x² + 3x + 4 = 0 - a = 2 b=3 c = 4, 3x² - 9x + 4 = 0 - a = 3 b= -9 c = 4, 4x² + 5x - 8 = 0 - a = 4 b = 5 c = -8, -x² + 9x - 2 = 0 - a = -1 b = 9 c = -2,

Math

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？