已知a+b=一2,ab=一5/2,求a(a+b)(a一b)一a(a+b)^2的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 13:40:13
![已知a+b=一2,ab=一5/2,求a(a+b)(a一b)一a(a+b)^2的值](/uploads/image/z/11508133-13-3.jpg?t=%E5%B7%B2%E7%9F%A5a%2Bb%3D%E4%B8%802%2Cab%3D%E4%B8%805%2F2%2C%E6%B1%82a%28a%2Bb%29%28a%E4%B8%80b%29%E4%B8%80a%28a%2Bb%29%5E2%E7%9A%84%E5%80%BC)
x){}Klh0IӦF:66%j 55"I@3z>i"}JPn{m!2I`v,XV(1 ̇qOCh=654/.H̳:̱C7IdP KKd&2D3 V
已知a+b=一2,ab=一5/2,求a(a+b)(a一b)一a(a+b)^2的值
已知a+b=一2,ab=一5/2,求a(a+b)(a一b)一a(a+b)^2的值
已知a+b=一2,ab=一5/2,求a(a+b)(a一b)一a(a+b)^2的值
原式=a(a+b)[(a-b)-(a+b)]
=-2ab(a+b)
=-2×(-5/2)×(-2)
=-10
=a(a+b)(a-b-a-b)=-2ab(a+b)=-2*(-5/2)*(-2)=-10