> 数学 >
已知a=2x^2+3xy-8x+3,b=3x^2-2xy+x-5,且3a-2b的值与x无关,求y
人气:266 ℃ 时间:2020-02-04 07:07:52
解答
3a-2b=3(2x^2+3xy-8x+3)-2(3x^2-2xy+x-5)
=6x^2+9xy-24x+9-6x^2+4xy-2x+10
=13xy-26x+19
=13x *(y-2)+19
y-2=0
y=2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版