>
数学
>
先化简,再求值:(a+2)(a-2)+2(a
2
+3),其中a=
1
3
.
人气:218 ℃ 时间:2019-11-10 10:57:27
解答
(a+2)(a-2)+2(a
2
+3)
=a
2
-4+2a
2
+6
=3a
2
+2,
当a=
1
3
时,原式=3×
(
1
3
)
2
+2=2
1
3
.
推荐
先化简,再求值:(x+1)(2x-1)-(x-3)2,其中x=-2.
先化简,再求值:1/a+√(a²+1/a²-2),其中a=1/3
先化简,再求值:a2−1a2−2a+1÷a+1/a3−a2,其中a=3.
先化简,再求值:2b²+(a+b)(a-b)-(a-b)²,其中a=3.b=1/2
[2012·贵阳]先化简再求值:2b²+(a+b)(a-b)-(a-b)²,其中a=-3,b=1/2
急求春游作文开头
Other'S help god helps those who help 什么意思
天上最亮的星星..
猜你喜欢
童年 第四章主要内容
设Sn为数列{an}的前n项和,Sn=kn2+n,n∈N*,其中k是常数. (Ⅰ)求a1及an; (Ⅱ)若对于任意的m∈N*,am,a2m,a4m成等比数列,求k的值.
she happend to be there at this time yesterday m
一小学英语改错题
3.2克二氧化硫与几克三氧化硫所含的氧原子个数相同
It is only during the time when the mount lock is obtained that will affect other jobs.
Our teacher is going to have me_the desk with you.
same,the,every,country,traffic,light,are,the,in.连词成句
© 2024 79432.Com All Rights Reserved.
电脑版
|
手机版