x^2 5x=36怎么计算

2025-12-16 12:03:04
推荐回答(1个)
回答1:

x2+15x-36=0 (x+7.5)2=36+225/4 x+15/2=±3√41/2 x1=-15/2+3√41/2 x2=-15/2-3√41/2