更新时间2022-02-27 06:23:22
1、将 x = 1,y = 2,带入方程,3 * 1 + a * 2 = -1,2a = -4,a = -2;
2、表达式 y = ax + b/x;
带入两组数值,a + b = -4 ① 2a + b/2 = 5 ②
② * 2 - ①,3a = 14,a = 14/3;
b = -4 - a = -4 - 14/3 = -26/3;
函数表达式 y = 14x/3 - 26/(3x);
x = -2 时,y = 14 * (-2)/3 - 26/[ 3 * (-2) ] = -28/3 + 13/3 = -5 。