早教吧作业答案频道 -->数学-->
计算:(1)(x+y-z)(x+y+z).(2)(x+y-z)(x-y-z).(3)(x+y+z)(x-y-z).(4)(x+y-z)(x-y+z).
题目详情
计算:
(1)(x+y-z)(x+y+z).
(2)(x+y-z)(x-y-z).
(3)(x+y+z)(x-y-z).
(4)(x+y-z)(x-y+z).
(1)(x+y-z)(x+y+z).
(2)(x+y-z)(x-y-z).
(3)(x+y+z)(x-y-z).
(4)(x+y-z)(x-y+z).
▼优质解答
答案和解析
(1)原式=[(x+y)-z][(x+y)+z]
=(x+y)2-z2
=x2+2xy+y2-z2;
(2)原式=[(x-z)+y][(x-z)-y]
=(x-z)2-y2
=x2-2xz+z2-y2;
(3)原式=[x+(y+z)][x-(y+z)]
=x2-(y+z)2
=x2-y2-z2-2yz;
(4)原式=[x+(y-z)][x-(y-z)]
=x2-(y-z)2
=x2-y2-z2+2yz.
=(x+y)2-z2
=x2+2xy+y2-z2;
(2)原式=[(x-z)+y][(x-z)-y]
=(x-z)2-y2
=x2-2xz+z2-y2;
(3)原式=[x+(y+z)][x-(y+z)]
=x2-(y+z)2
=x2-y2-z2-2yz;
(4)原式=[x+(y-z)][x-(y-z)]
=x2-(y-z)2
=x2-y2-z2+2yz.
看了计算:(1)(x+y-z)(x...的网友还看了以下:
在下列格式的括号内填上适当的项1.x-y-z=x+?=x-?2.1-x的平方+xy-y的平方=1- 2020-04-07 …
已知x/2=y/7=z/5,则(x+y-z)/x的值为?已知数x、y、z满足关系式(y+z)/x= 2020-06-02 …
导数相关的题.1.当K取何值时,分段函数:x不等于0时,f(x)=x的k次方乘以sin(1/x), 2020-06-11 …
X.Y.Z是短周期元素,有Y负离子.Z负离子的粒子的结构相同,Y和X有原子比为1:1的化合物甲,原 2020-06-13 …
求函数的驻点f'x(x,y)=2xy(4-x-y)-x^2y=0.(1)其中f'x(x,y)中左边 2020-07-11 …
F(x)=x(e^x-1)-ax^2,若当x≥0时f(x)≥0,求a的取值范围?f(xF(x)=x 2020-07-26 …
下列各选项中的M与P表示同一个集合的是()A.M={x∈R|x2+0.01=0},P={x|x2=0 2020-10-31 …
1、已知x+y+z=0求x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)+62、x- 2020-10-31 …
几个集合的题……1.设集合A={x▏-2≤x≤a},B={y▏1.y=2x+3,x∈A},C={z▏ 2020-11-01 …
已知(y+z-x)/(x+y+z)=(z+x-y)/(y+z-x)=(x+y-z)/(z+x-y)= 2020-11-01 …