a,(3x^2−11x^2−5y)(8xy−5x+6)(3x^2−11×2−5y)(8xy−5x+6) b,(−4x^2y−5x^2+3y^2)(2x^2−xy+3y^2)

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2. `a,(3x^2−11x^2−5y)(8xy−5x+6)`

   `=24x^3y−15x^3+18x^2−88x^3y+55x^3−66x^2−40xy^2+25xy−30y`

   `=−64x^3y+40x^3−48x^2−40xy^2+25xy−30y`

   `b,(−4x^2y−5x^2+3y^2)(2x^2−xy+3y^2)`

   `=−8x^4y+4x^3y^2−12x^2y^3−10x^4+5x^3y−15x^2y^2+6x^2y^2−3xy^3+9y^4`

   `=−10x^4+9y^4−8x^4y+4x^3y^2−12x^2y^3+5x^3y−9x^2y^2−3xy^3+9y^4`

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