⑴25x²—16y² (2)(a—b)(x—y)—(b—a)(x+y) (3)a²—4ab
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⑴25x²—16y² (2)(a—b)(x—y)—(b—a)(x+y) (3)a²—4ab+4b² (4)4+12(x—y)+9(X—y)²
![⑴25x²—16y² (2)(a—b)(x—y)—(b—a)(x+y) (3)a²—4ab](/uploads/image/z/18130186-10-6.jpg?t=%E2%91%B425x%26sup2%3B%E2%80%9416y%26sup2%3B+%EF%BC%882%EF%BC%89%EF%BC%88a%E2%80%94b%29%28x%E2%80%94y%EF%BC%89%E2%80%94%EF%BC%88b%E2%80%94a%EF%BC%89%EF%BC%88x%2By%EF%BC%89+%EF%BC%883%EF%BC%89a%26sup2%3B%E2%80%944ab)
25x²—16y²
=(5x)^2-(4y)^2
=(5x+4y)(5x-4y)
(a—b)(x—y)—(b—a)(x+y)
=(a—b)(x—y)+(a-b)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
a²—4ab+4b²
=(a-2b)^2
=(a-2b)(a-2b)
4+12(x—y)+9(X—y)²
=[(3(x-y)+2]^2
=[(3(x-y)+2][(3(x-y)+2]
=(5x)^2-(4y)^2
=(5x+4y)(5x-4y)
(a—b)(x—y)—(b—a)(x+y)
=(a—b)(x—y)+(a-b)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
a²—4ab+4b²
=(a-2b)^2
=(a-2b)(a-2b)
4+12(x—y)+9(X—y)²
=[(3(x-y)+2]^2
=[(3(x-y)+2][(3(x-y)+2]
分解因式 x²(x²-y²)+z²(y²-x²) (a+b)
3a-3b/10ab*25a²b³/a²-b² x²-4y²
若x²+4y²=(x+2y)²+A=(x-2y)²+B,则A= B=
1.(b²+2a²)(2a²-b²) 2.(4x²-4y²)
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