> 数学 >
已知A=5a+3b,B=3a²-2a²b,C=a²+7a²b-2,求A-2B+3C的值
人气:179 ℃ 时间:2019-08-21 19:03:33
解答
A-2B+3C=5a+3b-2*(3a^2-2a^2b)+3(a^2+7a^2b-2)
=5a+3b-6a^2+4a^2b+3a^2+21a^2b-6
=5a+3b-3a^2+25a^2b-6
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版