3a²(X-Y)²-4b²(Y-X)².其中X=4,Y=3,a=b(先分解因式,在求值)
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3a²(X-Y)²-4b²(Y-X)².其中X=4,Y=3,a=b(先分解因式,在求值)
3a²(X-Y)²-4b²(Y-X)².其中X=4,Y=3,a=b(先分解因式,在求值)
3a²(X-Y)²-4b²(Y-X)².其中X=4,Y=3,a=b(先分解因式,在求值)
原式=3a²(x-y)²-4b²(x-y)²
=(x-y)²(3a²-4b²)
=(4-3)²(3a²-4a²)
=-a²