(2x-3y)(2x+3y)-4x(x-1),其中x=-2,y=-1/3
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(2x-3y)(2x+3y)-4x(x-1),其中x=-2,y=-1/3(2x-3y)(2x+3y)-4x(x-1),其中x=-2,y=-1/3(2x-3y)(2x+3y)-4x(x-1),其中x=-
(2x-3y)(2x+3y)-4x(x-1),其中x=-2,y=-1/3
(2x-3y)(2x+3y)-4x(x-1),其中x=-2,y=-1/3
(2x-3y)(2x+3y)-4x(x-1),其中x=-2,y=-1/3
(2x-3y)(2x+3y)-4x(x-1)
=4x^2-9y^2-4x^2+4x
=4x-9y^2
=4*(-2)-9*(-1/3)^2
=-8-9*1/9
=-8-1
=-9
解 (2x-3y)(2x+3y)-4x(x-1)
=4x²-9y²-4x²+4x
=-9y²+4x
当x=-2,y=-1/3时
原式=-9×(-1/3)²+4×(-2)
=-9×(1/9)-8
=-1-8
=-9
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