【急!】a=1/2,求a²-3a+5+a²+2a-1
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/18 02:14:06
![【急!】a=1/2,求a²-3a+5+a²+2a-1](/uploads/image/z/13132640-56-0.jpg?t=%E3%80%90%E6%80%A5%21%E3%80%91a%3D1%2F2%2C%E6%B1%82a%26%23178%3B-3a%2B5%2Ba%26%23178%3B%2B2a-1)
x){0YR
m
tmlJTS645N6Նru
mIӠ_`gC//Ư(1H7Q{h&PLDāl] qMlβsN*VPtYӳys}~Oϋ_r: ҹO.{sΧWӈ$
【急!】a=1/2,求a²-3a+5+a²+2a-1
【急!】a=1/2,求a²-3a+5+a²+2a-1
【急!】a=1/2,求a²-3a+5+a²+2a-1
解a²-3a+5+a²+2a-1
=2a^2-a+4
=2(1/2)^2-(1/2)+4
=1/2-1/2+4
=4
a=1/2
a²-3a+5+a²+2a-1
=2a²-a+4
=2*1/4-1/2+4
=4
如果不懂,请追问,祝学习愉快!