а)(5-а)(3а+1)-3а(4-а)=15a+5-3a^2-a-12a+3a^2 = 2a+5
б)(2-х)(х+2)+(х+2)^2=2x+4-x^2-2x+x^2+2x+2x+4=4x+8
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а)(5-а)(3а+1)-3а(4-а)=15a+5-3a^2-a-12a+3a^2 = 2a+5
б)(2-х)(х+2)+(х+2)^2=2x+4-x^2-2x+x^2+2x+2x+4=4x+8
б)(2-х)(х+2)+(х+2)^2=2x+4-x^2-2x+x^2+2x+2x+4=4x+8