Question

几道分解因式题，大家帮帮我吧！！！很急~~~总之谢谢大家了！！

1.4-(3a+2b)^2
2.(x^2+4)^2-16x^2
3.(3a-4b)(7a-8b)+(11a-12b)(7a-8b)
4.x^3z-4x^2yz+4xy^2z
5.(x+2)(x+3)+x^2-4
6.(a^2+b^2-1)^2-4a^2b^2
7.[(1/2)x+(2/3)y-(3/4)z)^2]-[(1/2)x-(2/3)y-(3/4)z)^2]
8.4b^2c^2-(b^2+c^2-a^2)^2
拜托大家了！！！！！

Answer 1

1.4-(3a+2b)^2 =-9a^2-12ab-4b^+4
2.(x^2+4)^2-16x^2 =-13x^2+8x+16
3.(3a-4b)(7a-8b)+(11a-12b)(7a-8b)=109a^2-224ab+128b^2
4.x^3z-4x^2yz+4xy^2z =这题不用做了吧
5.(x+2)(x+3)+x^2-4 =2x^2+12x+2
6.(a^2+b^2-1)^2-4a^2b^2 =a^4-2a^3b^2-2a^2b^-a^2+b^4-2b^2+1
7.[(1/2)x+(2/3)y-(3/4)z)^2]-[(1/2)x-(2/3)y-(3/4)z)^2] =太复杂了
8.4b^2c^2-(b^2+c^2-a^2)^2 =做不了