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(5x+3/4)²=25x²+2*5x*3/4+(3/4)²= 25x²+7,5x+9/16
(5x/3+1/2)(5x/3-1/2)= (5x/3)²-(1/2)²=25x²/9-1/4
d)(6-3x)(4x-6)-5x(3x+2)=24x-36-12x²+18x-15x²-10x=27x² +32x-36