初中乘法公式的一些题目1.（5-3m)²2.(-5ayz+1/5a²)²3.(a+b)²(a-b)²(a²+b²)²4.（a-b-c)²5.(2a+3b-4c)²6.(a+b+c+d)(a+b-c-d)7.(a+b+c+d)²8.(x+y)(x-y)9.(3x+2y)(3x-2y)10.(-3x+2y)(-3x-2y)11.(7mn&s

初中乘法公式的一些题目
1.（5-3m)²
2.(-5ayz+1/5a²)²
3.(a+b)²(a-b)²(a²+b²)²
4.（a-b-c)²
5.(2a+3b-4c)²
6.(a+b+c+d)(a+b-c-d)
7.(a+b+c+d)²
8.(x+y)(x-y)
9.(3x+2y)(3x-2y)
10.(-3x+2y)(-3x-2y)
11.(7mn²-8cd²)(7m²n+8cd²)
12.1/5(30a²+15b²)(6a²-3b²)
13.(x+2y-3)(x-2y+3)
14.(x+1/x)²-(x-1/x)²
15.(2a-b)²-2b²
16.(5m+3n)²-(2m-n)²
17.[(a+b)²+(a+b)²](a²-b²)
18.(a-2b+3c-1)(a-2b-3c+1)
19.(p+2z)²-2(p+2z)(p+3z)+(p+3z)²
20.(-mn+ab)²
21.(3x-1/2y)²
22.（-1/3m²n+3/4mn²)²
23.已知(a-b)²=7,（a+b)²=13求a²+b²,ab的值.
在8：30之前。

1.（5-3m)²=25-30m+9m^2
2.(-5ayz+1/5a²)²=25a^2y^2z^2-2*5ayz*1/5a^2+1/25a^4=25a^2y^2z^2-2a^3yz+1/25a^4
3.(a+b)²(a-b)²(a²+b²)²
=[(a^2-b^2)]^2(a^2+b^2)^2
=(a^4-b^4)^2
=a^8-2a^4b^4+b^8
4.（a-b-c)²
=[a-(b+c)]^2
=a^2-2a(b+c)+(b+c)^2
=a^2-2ab-2ac+b^2+2bc+c^2
5.(2a+3b-4c)²
=4a^2+4a(3b-4c)+(3b-4c)^2
=4a^2+12ab-16ac+9b^2-24bc+16c^2
6.(a+b+c+d)(a+b-c-d)
=[(a+b)+(c+d)][(a+b)-(c+d)]
=(a+b)^2-(c+d)^2
=a^2+2ab+b^2-c^2-2cd-d^2
7.(a+b+c+d)²
=(a+b)^2+2(a+b)(c+d)+(c+d)^2
=a^2+2ab+b^2+2ac+2ad+2bc+2bd+c^2+2cd+d^2
8.(x+y)(x-y)
=x^2-y^2
9.(3x+2y)(3x-2y)
=9x^2-4y^2
10.(-3x+2y)(-3x-2y)
=9x^2-4y^2
11.(7mn²-8cd²)(7mn^2+8cd²)
=49m^2n^4-64c^2d^4
12.1/5(30a²+15b²)(6a²-3b²)
=1/5*5(6a^2+3b^2)(6a^2-3b^2)
=36a^4-9b^4
13.(x+2y-3)(x-2y+3)
=[x+(2y-3)][x-(2y-3)]
=x^2-(2y-3)^2
=x^2-4y^2+12y-9
14.(x+1/x)²-(x-1/x)²
=(x+1/x+x-1/x)(x+1/x-x+1/x)
=2x*2/x
=4
15.(2a-b)²-2b²
=4a^2-4ab+b^2-2b^2
=4a^2-4ab-b^2
16.(5m+3n)²-(2m-n)²
=(5m+3n+2m-n)(5m+3n-2m+n)
=(7m+2n)(3m+4n)
17.[(a+b)²+(a+b)²](a²-b²)
=2(a+b)^2(a+b)(a-b)
=2(a+b)^3(a-b)
18.(a-2b+3c-1)(a-2b-3c+1)
=[(a-2b)+(3c-1)][(a-2b)-(3c-1)]
=(a-2b)^2-(3c-1)^2
=a^2-4ab+4b^2-9c^2+6c-1
19.(p+2z)²-2(p+2z)(p+3z)+(p+3z)²
=[(p+2z)-(p+3z)]^2
=(-z)^2
=z^2
0.(-mn+ab)²
=m^2n^2-2mnab+a^2b^2
21.(3x-1/2y)²
=9x^2-3xy+1/4y^2
22.（-1/3m²n+3/4mn²)²
=1/9m^4n^2-2*1/3m^2n*3/4mn^2+9/16m^2n^4
=1/9m^4n^2-1/2m^3n^3+9/16m^2n^4
23.已知(a-b)²=7,（a+b)²=13求a²+b²,ab的值.
a^2-2ab+b^2=7.[1]
a^2+2ab+b^2=13.[2]
[1]+[2]:
2(a^2+b^2)=20
a^2+b^2=10
[2]-[1]:
4ab=6
ab=3/2.
好累啊!