(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-(x-3y)(3x+4y) 坐等!写得好,给给赏分
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(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-(x-3y)(3x+4y)坐等!写得好,给给赏分(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-
(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-(x-3y)(3x+4y) 坐等!写得好,给给赏分
(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-(x-3y)(3x+4y) 坐等!
写得好,给给赏分
(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-(x-3y)(3x+4y) 坐等!写得好,给给赏分
解得:
1.(2x-3y)^2-(y+3y)(3x-y)
==(2x-3y)*(2x-3y)--(3xy-y*y+9xy-3xy)
==4x*x-6xy-6xy+9y*y-3xy+y*y-9xy+3xy
==4x*x--24xy+13y*y
2.(3x+2y)(2x+3y)-(x-3y)(3x+4y)
==6x*x+9xy+4xy+6y*y--(3x*x+4xy--9xy+12y*y)
==6x*x+9xy+4xy+6y*y--3x*x--4xy+9xy--12y*y
==3x*x+18xy-6y*y
==3(x*x+6xy-2y*y)
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