初一因式分解计算

题目

初一因式分解计算
计算：
1.（a+2b-3c)（a-2b+3c)
2.(x-2y+z)(-x+2y+z)
3.(-1/3xy+3/2y^2-x^2)(-6xy^2)^2
4.(x+1)(x^2+1)(x^4+1)(x-1)

答案

1.（a+2b-3c)（a-2b+3c) =（a+(2b-3c))（a-(2b-3c)) =a^2-(2b-3c)^2=a^2-(4b^2+9c^2-12bc)=a^2-4b^2-9c^2+12bc2.(x-2y+z)(-x+2y+z) =(z+(x-2y))(z-(x-2y))=z^2-(x-2y)^2=z^2-x^2-4y^2+4xy3.(-1/3xy+3/2y^2-x^2)(-6xy...