Ответ:
#1
е) (a−b)(a+b)(a2+b2)(a4+b4)= (a2+ab−ba−b2)(a2+b2)(a4+b4)=(a2+ab−ba−b2)(a2+b2)(a4+b4)=(a2−b2)(a2+b2)(a4+b4)= (a4+a2b2−b2a2−b4)(a4+b4)(a4+a2b2−b2a2−b4)(a4+b4)=(a4−b4)(a4+b4)=a8+a4b4−b4a4−b8=a8+a4b4−b4a4−b8=a8−b8=a8−b8
#2
а)201*199=200*(200-1)+199=200*200-200+199=200*200-1=40000-1=39999
б)74*66=7884
в)29.8*30,2=899,96
#3
формула квадратов (a+b)^2=a^2+2ab+b^2
а)(y+4)^2=y*y+4*y+4*y+4*4=
в)
б)
г)
д)
е)
#4
а)
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Answers & Comments
Ответ:
#1
е) (a−b)(a+b)(a2+b2)(a4+b4)= (a2+ab−ba−b2)(a2+b2)(a4+b4)=(a2+ab−ba−b2)(a2+b2)(a4+b4)=(a2−b2)(a2+b2)(a4+b4)= (a4+a2b2−b2a2−b4)(a4+b4)(a4+a2b2−b2a2−b4)(a4+b4)=(a4−b4)(a4+b4)=a8+a4b4−b4a4−b8=a8+a4b4−b4a4−b8=a8−b8=a8−b8
#2
а)201*199=200*(200-1)+199=200*200-200+199=200*200-1=40000-1=39999
б)74*66=7884
в)29.8*30,2=899,96
#3
формула квадратов (a+b)^2=a^2+2ab+b^2
а)(y+4)^2=y*y+4*y+4*y+4*4=
в)
б)
г)
д)
е)
#4
а)
б)
в)
г)
д)