(1) (1-a)^2(1+a)^2=(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=(3) (x^2+x+1)(x^2-x+1)=

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(1)(1-a)^2(1+a)^2=(2)(2+1)(2^2+1)(2^4+1)(2^8+1)+1=(3)(x^2+x+1)(x^2-x+1)=(1)(1-a)^2(1+a)^2=(2)(2+1)(2

(1) (1-a)^2(1+a)^2=(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=(3) (x^2+x+1)(x^2-x+1)=
(1) (1-a)^2(1+a)^2=
(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=
(3) (x^2+x+1)(x^2-x+1)=

(1) (1-a)^2(1+a)^2=(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=(3) (x^2+x+1)(x^2-x+1)=
原式=[(1-a)(1+a)]²
=(1-a²)²
=1-2a²+a^4
原式=(2-1)(2+1)(2²+1)(2^4+1)(2^8+1)+1
=(2²-1)(2²+1)(2^4+1)(2^8+1)+1
=(2^4-1)(2^4+1)(2^8+1)+1
=(2^8-1)(2^8+1)+1
=2^16-1+1
=2^16
原式=[(x²+1)+x][(x²+1)-1]
=(x²+1)²-x²
=x^4+2x²+1-x²
=x^4+x²+1

∵ADE=ABC
∴DE//BC
∵BE⊥AC,MN⊥AC
∴BE//MN
∴角1=角EBC
角EBC=角2
∴角1=角2
希望对你能有所帮助。

(1)=(1-a^2)^2=1+a^4-2a^2
(2)=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)+1=2^16 -1+1=2^16
(3)=(x^2+1)^2-x^2=x^4+2x^2+1-x^2=x^4+x^2+1(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=
=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)+...

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(1)=(1-a^2)^2=1+a^4-2a^2
(2)=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)+1=2^16 -1+1=2^16
(3)=(x^2+1)^2-x^2=x^4+2x^2+1-x^2=x^4+x^2+1

收起

(1) (1-a)^2(1+a)^2=(1-a^2)(1-a^2)=1-2a^2+a^4
(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)+1
=(2^2-1)(2^2+1)(2^4+1)(2^8+1)+1=(2^4-1)(2^4+1)(2^8+1)+1=(2^8-1)(2^8+1...

全部展开

(1) (1-a)^2(1+a)^2=(1-a^2)(1-a^2)=1-2a^2+a^4
(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)+1
=(2^2-1)(2^2+1)(2^4+1)(2^8+1)+1=(2^4-1)(2^4+1)(2^8+1)+1=(2^8-1)(2^8+1)+1=2^16-1+1=2^16
(3) (x^2+x+1)(x^2-x+1)= (x^2+1+x)(x^2+1-x)=(x^2+1)^2-x^2=x^4+3x^2+1

收起

(1-a)^2(1+a)^2=(1²-a²)²=1-2a²+a^4
(2+1)(2^2+1)(2^4+1)(2^8+1)+1=(2-1)(2+1)(2²+1)(2^4+1)(2^8+1)+1
=(2²-1)(2²+1)(2^4+1)(2^8+1)+1
=(2^4-1)(2^4+1)(2^8+1)+1

全部展开

(1-a)^2(1+a)^2=(1²-a²)²=1-2a²+a^4
(2+1)(2^2+1)(2^4+1)(2^8+1)+1=(2-1)(2+1)(2²+1)(2^4+1)(2^8+1)+1
=(2²-1)(2²+1)(2^4+1)(2^8+1)+1
=(2^4-1)(2^4+1)(2^8+1)+1
=(2^8-1)(2^8+1)+1
=2^16-1+1
=2^16
=65536
(x^2+x+1)(x^2-x+1)=(x²+1)²-x²=x^4+x²+1

收起

(1) (1-a)^2(1+a)^2=((1-a)(1+a))^2=(a^2-1)^2=a^4-2a^2+1
(2) (2+1)(2^2+1)(2^4+1)(2^8+1)+1=3*5*17*256+1=2^16+1
(3)(x^2+x+1)(x^2-x+1)=(x^2+1)^2-x^2=x^4+2x^2+1-x^2=x^4+x^2+1