(1)X^3-6X²+9X (2)(M+N)²-6(M+N)+9 (3)4M²-3N(4M-3N)

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(1)X^3-6X²+9X (2)(M+N)²-6(M+N)+9 (3)4M²-3N(4M-3N)
(1)X^3-6X²+9X (2)(M+N)²-6(M+N)+9 (3)4M²-3N(4M-3N)

(1)X^3-6X²+9X (2)(M+N)²-6(M+N)+9 (3)4M²-3N(4M-3N)
解(1)
原式=x(x²-6x+9)
=x(x-3)²
解(2)
原式=(m+n)²-2×(m+n)×3+3²
=[(m+n)-3]²
=(m+n-3)²
解(3)
原式=4m²-12mn+9n²
=(2m)²-2×2m×3n+(3n)²
=(2m-3n)²

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