计算(x+y-3)(x-y+3)还有(x-2y+3z)^2

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 15:45:00
计算(x+y-3)(x-y+3)还有(x-2y+3z)^2
x){nu5*+u55*t+5_lN=Um\~OgMR>V lȱ"HW:Į36Ե/.H̳kGWlmY-Own~6m. ƺ p Ƃ2hѶ`GFW@\k fږ4b*(#k8*Y q\"c U5@*7

计算(x+y-3)(x-y+3)还有(x-2y+3z)^2
计算(x+y-3)(x-y+3)
还有(x-2y+3z)^2

计算(x+y-3)(x-y+3)还有(x-2y+3z)^2
x^2-(y-3)^2=x^2-y^2+6y-9

x^2-y^2+6y-9

(x+y-3)(x-y+3)
=x的平方-(3-y) 的平方
=x^2-y^2+6y-9

(x+y-3)(x-y+3)=[x+(y-3)][x-(y-3)]=x^2-(y-3)^2=x^2-(y^2-6y+9)

=[x+(y-3)][x-(y-3)]
=x²-(y-3)²
=x²-y²+6y-9

-(x+y-3)的平方

x2-y2+3(2y-3)