作业帮(2x-3y)2-(4y-3x)(3x+4y)怎么做?
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(2x-3y)2-(4y-3x)(3x+4y)怎么做?
(2x-3y)2-(4y-3x)(3x+4y)怎么做?
(2x-3y)2-(4y-3x)(3x+4y)怎么做?
(2x-3y)²-(4y-3x)(3x+4y)
=(2x-3y)²+(3x-4y)(3x+4y)
=(4x²-12xy+9y²)+(9x²-16y²)
=4x²-12xy+9y²+9x²-16y²
=13x²-12xy-7y²
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=4x²-12xy+9y²-16y²+9x²
=13x²-12xy-7y²
(2x-3y)2-(4y-3x)(3x+4y)
=4x²+9y²-12xy -16y²+9x²
= 13x² -12xy -7y²
=4x-6y-12xy-16yy+9xx+12xy=4x-6y-16yy+9xx
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