题目

完全平方公式题(2)
注:括号后的数为次方
(2X+Y-3)2
(A+3B-2)(A-3B+2)
(X+Y+1)(1-X-Y)
[X+(Y+1)][X-(Y+1)]
(3X+Y-4)(3X+Y+4)-(3X+Y+4)(3X-Y-4)

提问时间：2020-10-31

答案

(2X+Y-3)^2 =(zx+y)^2-6(2x+y)+9=z^2 x^2+2xyz+y^2-12x-6y+9(A+3B-2)(A-3B+2) =[a+(3b-2)][a-(3b-2)]=a^2-(3b-2)^2=a^2-9b^2+12b-4(X+Y+1)(1-X-Y)=-(x+y-1)(x+y+1)=-(x+y)^2+1=-x^2-2xy-y^2+1 [X+(Y+1)][X-(Y+1)]=x^...