求100道关于平方差公式的题目和答案 求关于完全平方式、平方差公式的题目共5道 解和答案也要
\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u4f8b\u9898\u4ee5\u53ca\u5e73\u65b9\u5dee\u516c\u5f0f\u4f8b\u9898\uff08100\u4e2a\u4ee5\u4e0a\uff09\u8981\u504f\u7b80\u5355\u7684\uff0c\u5e76\u9644\u7b54\u6848\u3002\u7ec3\u4e60\u9898
\u2460\uff1a104²\uff08\u5de7\u7b97\uff09
\u89e3\uff1a\u539f\u5f0f=100²+2\u00d7100\u00d74+4²
=10000+800+16
=1086
\u2461\uff1a198²=\uff08200-2\uff09²
\u89e3\uff1a\u539f\u5f0f=200²-2\u00d7200\u00d72+2²
=40000-800+4
=39204
\u2462\uff1a \uff08xy+z)(-xy+z)
\u89e3:\u539f\u5f0f=-\uff08xy+z)(xy+z)
=-\uff08xy+z\uff09²
=-\uff08xy²+2xyz+z²\uff09
=-x²y²-2xyz-z²
\u2463\uff1a\uff08-x-y)(x+y)
\u89e3\uff1a\u539f\u5f0f=-(x+y)(x+y)
=-(x+y)²
=-x-2xy-y²
\u2464\uff1a(x-2)(x+2)(x²+4)
\u89e3\uff1a\u539f\u5f0f=(x²-4)(x²+4)
=x\u7684\u56db\u6b21\u65b9-16
6\uff0e(4x-3x)2\uff1b 7.(-4xy+ab)2\uff1b
8\uff0e10\u00b732\uff1b 9\uff0e(x-2y+3y)2\uff0e
\u89e3\uff1a6\uff0e(4x-3y)2
\uff1d(4x)2-2(4x)\u00b7(3y)+(3y)2
\uff1d16x2-24xy+9y2\uff0e
7\uff0e(-4xy+ab)2
\uff1d(-4xy)2+2(-4xy)\u00b7(ab)+(ab)2
\uff1d16x2y2-8abxy+a2b2
8\uff0e10.32\uff1d(10+0.3)2
\uff1d100+6+0.09\uff1d106.09\uff0e
9\uff0e(x-2y+3z)2
\uff1dx2+(-2y)2+(3z)2+2\u00b7x\u00b7(-2y)+2\u00b7x\u00b7
(3z)+2\u00b7(-2y)\u00b7(3z)
\uff1dx2+4y2+9z2-4xy+6xz-12yz\uff0e
\u4f8b\uff1a\u8fd0\u7528\u516c\u5f0f\u8ba1\u7b97(4a-3b+c)(4a+3b+c)
\u89e3\uff1a(4a-3b+c)(4a+3b+c)
\uff1d[(4a+c)-3b][(4a+c)+3b]
\uff1d(4a+c)2-(3b)2
\uff1d16a2+8ac+c2-9b2\uff0e
\u672c\u9898\u662f\u5e73\u65b9\u5dee\u516c\u5f0f\u4e0e\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u7efc\u5408\u8fd0\u7528\u7684\u8ba1\u7b97\u9898\uff0e\u5148\u8fd0\u7528\u5e73\u65b9\u5dee\u516c\u5f0f\u4ea4\u6362\u6210\u540c\u9879\u5728\u524d\u76f8\u53cd\u9879\u5728\u540e\u4e3a(4a+c-3b)(4a+c+3b)\uff0e\u518d\u7528\u5e73\u65b9\u5dee\u516c\u5f0f\u4e2d\u7684a\u4ee3\u63624a+c\uff0cb\u4ee3\u63623b\uff0e\u6700\u540e\u7528\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u8ba1\u7b97(4a+c)2\uff0e
1.(a+b)(a-b)=_____,公式的条件是_____,结论是_____.
2.(x-1)(x+1)=_____,(2a+b)(2a-b)=_____,( x-y)( x+y)=_____.
3.(x+4)(-x+4)=_____,(x+3y)(_____)=9y2-x2,(-m-n)(_____)=m2-n2
4.98×102=(_____)(_____)=( )2-( )2=_____.
5.-(2x2+3y)(3y-2x2)=_____.
6.(a-b)(a+b)(a2+b2)=_____.
7.(_____-4b)(_____+4b)=9a2-16b2,(_____-2x)(_____-2x)=4x2-25y2
8.(xy-z)(z+xy)=_____,( x-0.7y)( x+0.7y)=_____.
9.( x+y2)(_____)=y4- x2
10.观察下列各式:
(x-1)(x+1)=x2-1
(x-1)(x2+x+1)=x3-1
(x-1)(x3+x2+x+1)=x4-1
根据前面各式的规律可得
(x-1)(xn+xn-1+…+x+1)=_____.
二、选择题
11.下列多项式乘法,能用平方差公式进行计算的是( )
A.(x+y)(-x-y)
B.(2x+3y)(2x-3z)
C.(-a-b)(a-b)
D.(m-n)(n-m)
12.下列计算正确的是( )
A.(2x+3)(2x-3)=2x2-9
B.(x+4)(x-4)=x2-4
C.(5+x)(x-6)=x2-30
D.(-1+4b)(-1-4b)=1-16b2
13.下列多项式乘法,不能用平方差公式计算的是( )
A.(-a-b)(-b+a)
B.(xy+z)(xy-z)
C.(-2a-b)(2a+b)
D.(0.5x-y)(-y-0.5x)
14.(4x2-5y)需乘以下列哪个式子,才能使用平方差公式进行计算( )
A.-4x2-5y
B.-4x2+5y
C.(4x2-5y)2
D.(4x+5y)2
15.a4+(1-a)(1+a)(1+a2)的计算结果是( )
A.-1
B.1
C.2a4-1
D.1-2a4
16.下列各式运算结果是x2-25y2的是( )
A.(x+5y)(-x+5y)
B.(-x-5y)(-x+5y)
C.(x-y)(x+25y)
D.(x-5y)(5y-x)
三、解答题
17.1.03×0.97
18.(-2x2+5)(-2x2-5)
19.a(a-5)-(a+6)(a-6)
20.(2x-3y)(3y+2x)-(4y-3x)(3x+4y)
21.( x+y)( x-y)( x2+y2)
22.(x+y)(x-y)-x(x+y)
23.3(2x+1)(2x-1)-2(3x+2)(2-3x)
24.9982-4
*25.2003×2001-20022
答案
一、1.a2-b2 两数的和与这两数的差相乘 这两个数的平方差
2.x2-1 4a2-b2 x2-y2
3.16-x2 -x+3y -m+n
4.100-2 100+2 100 2 9996
5.4x4-9y2 6.a4-b4
7.3a 3a 5y -5y
8.x2y2-z2 x2-0.49y2
9.- x+y2 10.xn+1-1
二、11.C 12.D 13.C 14.A 15.B 16.B
三、17.0.9991 18.4x4-25 19.-5a+36
20.13x2-25y2 21. x4-y422.-y2-xy 23.30x2-11
24.996000 *25.-1
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绛旓細a^2-b^2= (2a+3b)(2a-3b)= c^4-d^4= (a^2-b^2)/(a-b)= ( 鈭3+ 鈭2)( 鈭3- 鈭2)= 3-2= ( 鈭歛+ 鈭歜)( 鈭歛- 鈭歜)= 鑻>0,b>0.a-b=