这里的只要答案。
(x-y)(x-y)=____
(-x-y)(x+y)=___
(-x-y)(x+y)=___
(a-1)*(___)=a²-1
(a-1)*(___)=a²-2a+1
(a+b)²-(a-b)²=___
(a+b)²+(a-b)²=___
(1/3x+3y)²=___
(1/2-3a))²=___
(-x-3y)²=___
(x+3)²=___
x²+6x+___=(x+3)²
x²+___+9y²=(x=3y)²
a²=___=1/4=(a=1/2)²
x²-8xy+___=(x-4y)²
(a+b)²-___=(a-b)²
下面的要过程阿。
(a-2b)(a-3b)+(a-2b)²-(a-3b)²
2(a+1)²2(2a-3)(2a+3)
(x+1/2)²+(x-1/2)²+(x+1/2)(x-1/2)
(1/3a-3/4b)²-(1/3a+3/4b)²
(x-2)(x+2)(x²+4)
(a+1)(xa-1)(a²-1)
(x+3y)²+2(x-y)(x+y)+(x-3y)²
[(a-1/2)²+(a+1/2)²](2a²-1/2)
(a+2b-3)(a+2b+3)
(x²+x+3)(x²-x-3)
(x+2y+3)²-(x-2y+3)(x-2y-3)
利用完全平方公式计算。
99.8²
2005²
来的就给答案。
不要废话、谢谢。
(x-y)²
-(x+y)²
-(x+y)²
a+1
a-1
4ab
2a²+2b²
1/9x²+2xy+9y²
(1/(2-3a))²=?
x²+6xy+9y²
x²+6x+9
9
6xy
(1/2)²
16y²
4ab
(a-2b)(a-3b)+(a-2b)²-(a-3b)²
=(a-3b)(a-2b-a+3b)+(a-2b)²
=b(a-3b)+(a-2b)²
=ab-3b²+a²-4ab+4b²
=a²-3ab+b²
=(a-b)²-ab
2(a+1)²2(2a-3)(2a+3)
=4(a+1)²(4a²-9)
(x+1/2)²+(x-1/2)²+(x+1/2)(x-1/2)
=x²+x+1/4+x²-x+1/4+x²-1/4
=3x²+1/4
(1/3a-3/4b)²-(1/3a+3/4b)²
=(1/3a-3/4b-1/3a-3/4b)(1/3a-3/4b+1/3a+3/4b)
=-3/2b*2/3a
=-ab
(x-2)(x+2)(x²+4)
=(x²-4)(x²+4)
=x的四次方-16
(a+1)(a-1)(a²-1)
=(a²-1)(a²-1)
(a²-1)²
(x+3y)²+2(x-y)(x+y)+(x-3y)²
=(x+3y)²+(x-3y)²+2(x-y)(x+y)
=2x²+18y²+2x²_2y²
=4x²+16y²
[(a-1/2)²+(a+1/2)²](2a²-1/2)
=(2a²+1/2)(2a²-1/2)
=4a的四次方-1/4
(a+2b-3)(a+2b+3)
=(a+2b)²-9
(x²+x+3)(x²-x-3)
=(x²+x+3)[x²-(x+3)]
=x的四次方-(x+3)²
(x+2y+3)²-(x-2y+3)(x-2y-3)
=(x+2y+3)²-(x-2y）²+9
=(x+2y)²+6(x+2y)+9-(x-2y）²+9
=6(x+2y+3)
99.8²
=(100-0.2)²
=10000-40+0.04
=9960.4
2005²
=(2000+5)²
=4000000+20000+25
=4020025