约分 1)5x/25x² 2)9ab²+6abc/3a²b3)9a²+6ab+b²/3a+b4)x²-36/2x+12
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约分 1)5x/25x² 2)9ab²+6abc/3a²b3)9a²+6ab+b²/3a+b4)x²-36/2x+12
约分 1)5x/25x² 2)9ab²+6abc/3a²b
3)9a²+6ab+b²/3a+b
4)x²-36/2x+12
约分 1)5x/25x² 2)9ab²+6abc/3a²b3)9a²+6ab+b²/3a+b4)x²-36/2x+12
1)5x/25x²
=1/5x
2)9ab²+6abc/3a²b
=3ab(3b+2c)/3a²b
=(3b+2x)/a
3)9a²+6ab+b²/3a+b
=(3a+b)²/(3a+b)
=3a+b
4)x²-36/2x+12
=(x+6)(x-6)/2(x+6)
=(x-6)/2