题目
(m^2+4m)^2+8(m^2+4m)+16
2.(3a-5b)^2-(5a-3b〉^2 3.4a^2-16a^4 4.4a^2-(a^2+1)^2 5.9x^2-y^2-6x+1
2.(3a-5b)^2-(5a-3b〉^2 3.4a^2-16a^4 4.4a^2-(a^2+1)^2 5.9x^2-y^2-6x+1
提问时间:2021-01-16
答案
初一数学因式分解
1.(m^2+4m)^2+8(m^2+4m)+16
解,得:
==[(m^2+4m)+4]^2
==(m^2+4m+4)^2
==(m+2)^4
2.(3a-5b)^2-(5a-3b〉^2
解,得:
==[(3a-5b)+(5a-3b)]*[(3a-5b)-(5a-3b)]
==(8a-8b)*(-2a-2b)
==-16(a-b)*(a+b)
3.4a^2-16a^4
解,得:
==4a^2(1-4a^2)
==4a^2(1+2a)(1-2a)
4.4a^2-(a^2+1)^2
解,得:
==[2a+(a^2+1)]*[ 2a-(a^2+1) ]
==(2a+a^2+1)*(2a-a^2-1)
==-(a+1)^2(a-1)^2
5.9x^2-y^2-6x+1
解,得:
== (9x^2-6x+1)-y^2
==(3x-1)^2-y^2
==(3x-1+y)(3x-1-y)
1.(m^2+4m)^2+8(m^2+4m)+16
解,得:
==[(m^2+4m)+4]^2
==(m^2+4m+4)^2
==(m+2)^4
2.(3a-5b)^2-(5a-3b〉^2
解,得:
==[(3a-5b)+(5a-3b)]*[(3a-5b)-(5a-3b)]
==(8a-8b)*(-2a-2b)
==-16(a-b)*(a+b)
3.4a^2-16a^4
解,得:
==4a^2(1-4a^2)
==4a^2(1+2a)(1-2a)
4.4a^2-(a^2+1)^2
解,得:
==[2a+(a^2+1)]*[ 2a-(a^2+1) ]
==(2a+a^2+1)*(2a-a^2-1)
==-(a+1)^2(a-1)^2
5.9x^2-y^2-6x+1
解,得:
== (9x^2-6x+1)-y^2
==(3x-1)^2-y^2
==(3x-1+y)(3x-1-y)
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