(3x-4y)(5x-4y)-(7x-8y)(6y-5x)

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(3x-4y)(5x-4y)-(7x-8y)(6y-5x)(3x-4y)(5x-4y)-(7x-8y)(6y-5x)(3x-4y)(5x-4y)-(7x-8y)(6y-5x)(3x-4y)(5x-4y

(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)

(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
=15x²-12xy-20xy+16y²-(42xy-35x²-48y²+40xy)
=15x²+35x²-32xy-42xy-40xy+16y²+48y²
=50x²-114xy+64y²
祝学习快乐!

3x-4y)(5x-4y