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