作业帮(a-2b+c+3d)(a+2b-c+3d)=
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(a-2b+c+3d)(a+2b-c+3d)=
(a-2b+c+3d)(a+2b-c+3d)=
(a-2b+c+3d)(a+2b-c+3d)=
(a-2b+c+3d)(a+2b-c+3d)
=[(a+3d)+(c-2b)][(a+3d)-(c-2b)]
=(a+3d)²-(c-2b)²
=a²+6ad+9d²-c²+4bc-4b²
（a-2b+c+3d)(a+2b-c+3d)=[（a+3d)+(-2b+c)][（a+3d)-(-2b+c)]
=（a+3d)^2-(-2b+c)^2
=a^2+6ad+9d^2-4b^2+4bc-c^2
(a-2b+c+3d)(a+2b-c+3d)
=(a+3d-2b+c)(a+3d+2b-c)
=(a+3d)^2-(2b-c)^2
=a^2+6ad+9d^2-4b^2+4bc-c^2
(a-2b+c+3d)(a+2b-c+3d)
=[(a+3d)-(2b-c)][(a+3d)+(2b-c)]
=(a+3d)^2-(2b-c)^2
=a^2+6ad+9d^2-4b^2+4bc-c^2
计算：a^3(b+c-d)+a^2b(c+d-a)-a^2c(d+a+b)
(a-2b+3c/a+b-c)-(a-b+c/a-c+b)+(2c-d/c-a-b)化简结果
(a-b+c/a+b-c)-(a-2b+3c/b-c+a)+(b-2c/c-a-b)
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(a-2b+c+3d)(a+2b-c+3d)=
(a+b+2c-3d)(a+b-2c+3d)用乘法公式计算.