高中议论文课文有哪些?:初一数学问题

来源:百度文库 编辑:中科新闻网 时间:2024/03/29 06:35:24
分解下列各式的因式:
1.(a-b)(x-y)-(b-a)(x+y)
2.2M(3x-y)平方-3n(y-3x)平方
3.25(x+y平方-16(x-y)平方
4.4m-m(3a-2)平方

1.(a-b)(x-y)-(b-a)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
2.2M(3x-y)平方-3n(y-3x)平方
=2M(3x-y)平方-3n(3x-y)平方
==(2M-3n)(3x-y)^2
3.25(x+y)平方-16(x-y)平方
=[5(x+y)-4(x-y)][5(x+y)+4(x-y)]
=(x+9y)(9x+y)
4.4m-m(3a-2)平方
=m[4-(3a-2)^2]
=m[2-(3a-2)][2+(3a-2)]
=m(4-3a)(3a)
=-3am(3a-4)
好好学呀

1. 2x(a-b)
2.(3x-y)^2(2m-3n)
3.9x^2+9y^2+82xy
4.m(6-3a)

1.(a-b)(x-y)-(b-a)(x+y)=(a-b)(x-y+x+y)=2x(a-b)
2.2M(3x-y)^2-3n(y-3x)^2=(2M-3n)(3x-y)^2
3.25(x+y)^2-16(x-y)^2
=25(x^2+2xy+y^2)-16(x^2-2xy+y^2)
=9x^2+82xy+9y^2
=(x+9y)(9x+y)
4.4m-m(3a-2)^2
=m[4-(9a^2-12a+4)]
=3m*a*(4-3a)

1.(a-b)(x-y)-(b-a)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
2.2M(3x-y)平方-3n(y-3x)平方
=2M(3x-y)平方-3n(3x-y)平方
==(2M-3n)(3x-y)^2
3.25(x+y)平方-16(x-y)平方
=[5(x+y)-4(x-y)][5(x+y)+4(x-y)]
=(x+9y)(9x+y)
4.4m-m(3a-2)平方
=m[4-(3a-2)^2]
=m[2-(3a-2)][2+(3a-2)]
=m(4-3a)(3a)
=-3am(3a-4)