化简:(1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-12
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化简:
(1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-
(1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-
1 |
2 |
(1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-
1
2x),
=(x2-4y2-4x2-y2+4xy+6x2+5y2-17xy)÷(-
1
2x),
=(3x2-13xy)÷(-
1
2x),
=-6x+26y;
(2)(-4x2+12x3y2-16x4y3)÷(-4x2)-(-2xy2-y)(-2xy-1),
=1-3xy2+4x2y3-(4xy2+4x2y3+y),
=1-3xy2+4x2y3-4xy2-4x2y3-y,
=1-7xy2-y.
1
2x),
=(x2-4y2-4x2-y2+4xy+6x2+5y2-17xy)÷(-
1
2x),
=(3x2-13xy)÷(-
1
2x),
=-6x+26y;
(2)(-4x2+12x3y2-16x4y3)÷(-4x2)-(-2xy2-y)(-2xy-1),
=1-3xy2+4x2y3-(4xy2+4x2y3+y),
=1-3xy2+4x2y3-4xy2-4x2y3-y,
=1-7xy2-y.
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