初二数学题 要有过程~~~
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-(-x-2y)^2+4x^2= (2x)^2-(x+2y)^2=[2x-(x+2y)][2x+(x+2y)]=(x-2y)(3x+2y)
81-(2-3z)^2=9^2-(2-3z)^2=[9-(2-3z)][9+(2-3z)]=(7+3z)(11-3z)
x^2-(x+y^2)^2=[x-(x+y^2)][x+(x+y^2)]=-y^2(2x+y^2)
12-3(e+2f)^2=3[4-(e+2f)^2=3{[2-(e+2f)][2+(e+2f)]=3{[2-e-2f][2+e+2f]}=3(2-e-+f)(2+e+2f)
81-(2-3z)^2=9^2-(2-3z)^2=[9-(2-3z)][9+(2-3z)]=(7+3z)(11-3z)
x^2-(x+y^2)^2=[x-(x+y^2)][x+(x+y^2)]=-y^2(2x+y^2)
12-3(e+2f)^2=3[4-(e+2f)^2=3{[2-(e+2f)][2+(e+2f)]=3{[2-e-2f][2+e+2f]}=3(2-e-+f)(2+e+2f)
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