初二数学若4x²+kx+25是一个完全平方式,则k=填空1.(a+2b)²=a²+()+4b²2.(3x-5)²=9x²+25+()3.(a-b)²=(a+b)²+()4.(a+b)²-()=a²+b²5.对于多项式16x²
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 08:56:50
![初二数学若4x²+kx+25是一个完全平方式,则k=填空1.(a+2b)²=a²+()+4b²2.(3x-5)²=9x²+25+()3.(a-b)²=(a+b)²+()4.(a+b)²-()=a²+b²5.对于多项式16x²](/uploads/image/z/2547313-25-3.jpg?t=%E5%88%9D%E4%BA%8C%E6%95%B0%E5%AD%A6%E8%8B%A54x%26%23178%3B%2Bkx%2B25%E6%98%AF%E4%B8%80%E4%B8%AA%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%BC%8F%2C%E5%88%99k%3D%E5%A1%AB%E7%A9%BA1.%EF%BC%88a%2B2b%EF%BC%89%26%23178%3B%3Da%26%23178%3B%2B%EF%BC%88%EF%BC%89%2B4b%26%23178%3B2.%EF%BC%883x-5%EF%BC%89%26%23178%3B%3D9x%26%23178%3B%2B25%2B%EF%BC%88%EF%BC%893.%EF%BC%88a-b%EF%BC%89%26%23178%3B%3D%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%2B%EF%BC%88%EF%BC%894.%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-%EF%BC%88%EF%BC%89%3Da%26%23178%3B%2Bb%26%23178%3B5.%E5%AF%B9%E4%BA%8E%E5%A4%9A%E9%A1%B9%E5%BC%8F16x%26%23178%3B)
初二数学若4x²+kx+25是一个完全平方式,则k=填空1.(a+2b)²=a²+()+4b²2.(3x-5)²=9x²+25+()3.(a-b)²=(a+b)²+()4.(a+b)²-()=a²+b²5.对于多项式16x²
初二数学若4x²+kx+25是一个完全平方式,则k=
填空
1.(a+2b)²=a²+()+4b²
2.(3x-5)²=9x²+25+()
3.(a-b)²=(a+b)²+()
4.(a+b)²-()=a²+b²
5.对于多项式16x²+1,填上一项,使之成为另一个式子的平方,则可以填()
6.已知:x-1/x=1,则x²+1/x²=()
7.已知:x+y=5,xy=6,则(x+1)(y+1)的值为()
计算
1.(3x+y/2)² 2.(x²-1)²
3.(-a+2b)² 4.(-1/2x-3)²
5.(a+b)(a-b)(a²-b²)
6.(x+2y)(x-2y)(x²+4y²)
先化简,在求值
2b²+(a+b)(a-b)-(a-b)²,其中,a=-3,b=1/2
用简便方法计算
10.2² 20又1/9*19又8/9
尽量快一点啊,作业啊,明天俺要交地,最好在十分钟之内!
初二数学若4x²+kx+25是一个完全平方式,则k=填空1.(a+2b)²=a²+()+4b²2.(3x-5)²=9x²+25+()3.(a-b)²=(a+b)²+()4.(a+b)²-()=a²+b²5.对于多项式16x²
感觉你打字的时间早做完了,有点耐心,多看看书,不难,一会也就做了
——————————————————
都是用到几个式子:
(ax+b)²=(ax)²+2abx+b²
(a+b)(a-b)=a²-b²