3m+2n-1)(3m-2n+1)
=[3m+(2n-1)][3m-(2n-1)]
=(3m)^2-(2n-1)^2
=9m^2-4n^2+4n-1
(5x-7)(7x-5)
=5x*7x-5x*5-7*7x+(-7)*(-5)
=35x^2-74x+35
(x-1)(x-2)-(x-3)(x+4)
=(x^2-3x+2)-(x^2+x-12)
=x^2-3x+2-x^2-x+12
=-4x+14 可以不?
整式的乘法!(3m+2n-1)(3m-2n+1)(5x-7)(7x-5)(x-1)(x-2)-(x-3)(x+4)
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