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)
x-y=1
所以原式=3a²(x-y)³-4b²(x-y)²
=(x-y)²[3a²(x-y)-4b²]
=1²×(3a²2×1-3a²)
=-a²
3a²(X-Y)²-4b²(Y-X)².其中X=4,Y=3,a=b(先分解因式,在求值)
x-y=1
所以原式=3a²(x-y)³-4b²(x-y)²
=(x-y)²[3a²(x-y)-4b²]
=1²×(3a²2×1-3a²)
=-a²