併項
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自己做
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睇答案
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a x + a y - b x - b y = a ( ) - b ( ) = ( ) () |
a x + a y - b x - by |
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a x - a y - b x + b y = a ( ) - b ( ) = ( ) ( ) |
a x - a y - b x + by |
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x2 - 2c - 2x + cx = x ( ) + c ( ) = ( ) ( )
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x2 - 2c - 2x + cx |
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36h2k+12k-3hk2-144h =3(12h2k+4k-hk2-48h) =3[12h ( )-k( ) ] = 3 ( ) ( )
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36h2k+12k-3hk2-144h =3(12h2k+4k-hk2-48h)
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x2+ax-bx+xy-by-ab = x ( ) -b ( ) = ( ) ( )
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x2+ax-bx+xy-by-ab
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