先分解因式,再求值: 3a²﹙x-y﹚³-4b²﹙y-x﹚².其中x=4,y=3,a=b.
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先分解因式,再求值: 3a²﹙x-y﹚³-4b²﹙y-x﹚².其中x=4,y=3,a=b.
先分解因式,再求值: 3a²﹙x-y﹚³-4b²﹙y-x﹚².其中x=4,y=3,a=b.
先分解因式,再求值: 3a²﹙x-y﹚³-4b²﹙y-x﹚².其中x=4,y=3,a=b.
3a²﹙x-y﹚³-4b²﹙y-x﹚²
=3a²(x-y)³-4b²(x-y)²
=(x-y)²(3a²x-3a²y-4b²) 其中x=4,y=3,a=b
=(4-3)²(3a²×4-3a²×3-4a²)
=1×(12a²-9a²-4a²)
=-a²
3a²﹙x-y﹚³-4b²﹙y-x﹚²
=(x-y)²(3a²(x-y)-4b²)
=1²*(3a²-4a²)
=-a²
3a²﹙x-y﹚³-4b²﹙y-x﹚²
=-3a²﹙y-x﹚³-4b²﹙y-x﹚²
=-(y-x)²(3a²+4b²)
=-3a²-4b²)