问题
填空题
已知：
|
答案
=2x-3 (x-1)(x+2)
+A x-1
=B x+2 A(x+2)+B(x-1) (x-1)(x+2)
=(A+B)x+2A-B (x-1)(x+2)
∴
解得A+B=2 2A-B=-3
．A=- 1 3 B= 7 3
搜题请搜索小程序“爱下问搜题”
已知：
|
=2x-3 (x-1)(x+2)
+A x-1
=B x+2 A(x+2)+B(x-1) (x-1)(x+2)
=(A+B)x+2A-B (x-1)(x+2)
∴
解得A+B=2 2A-B=-3
．A=- 1 3 B= 7 3