A=x²+xy+y²;B=-3xy-x²,求2A-3B的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/11 21:22:17
![A=x²+xy+y²;B=-3xy-x²,求2A-3B的值](/uploads/image/z/10381978-10-8.jpg?t=A%3Dx%26%23178%3B%2Bxy%2By%26%23178%3B%EF%BC%9BB%3D-3xy-x%26%23178%3B%2C%E6%B1%822A-3B%E7%9A%84%E5%80%BC)
x)sPS64֮Ԯ0dk\QyQ
{lӨ_`gC`>ek~O6S:u2ŠZ`ꍀ:-cD)L!B<;lS8#28#$5 &p]
A=x²+xy+y²;B=-3xy-x²,求2A-3B的值
A=x²+xy+y²;B=-3xy-x²,求2A-3B的值
A=x²+xy+y²;B=-3xy-x²,求2A-3B的值
2A-3B
=2(x²+xy+y²)-3(-3xy-x²)
=2x²+2xy+2y²+9xy+3x²
=5x²+11xy+2y²
5*x^2+11xy+2*y^2