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Ta có: \(36^2+64^2+2\cdot36\cdot64=\left(36+64\right)^2=100^2=10000\)
a) \(56^2+44^2+2.56.44=56^2+2.56.44+44^2=\left(56+44\right)^2=100^2=10000\)
b) \(36^2+64^2+72.64=36^2+2.36.64+64^2=\left(36+64\right)^2=100^2=10000\)
c) \(136^2+36^2-72.136=136^2-2.36.136+36^2=\left(136-36\right)^2=100^2=10000\)
a) $56^2+44^2+2.56.44=56^2+2.56.44+44^2=\left(56+44\right)^2=100^2=10000$562+442+2.56.44=562+2.56.44+442=(56+44)2=1002=10000
b) $36^2+64^2+72.64=36^2+2.36.64+64^2=\left(36+64\right)^2=100^2=10000$362+642+72.64=362+2.36.64+642=(36+64)2=1002=10000
c) $136^2+36^2-72.136=136^2-2.36.136+36^2=\left(136-36\right)^2=100^2=10000$
y4 + 64 = y4 + 16y2 + 64 - 16y2
<=>y4-y4-16y2+16y2+64-64
<=>0=0
Vậy có vô số y thoa mãn
y4 + 64 = y4 + 16y2 + 64 - 16y2
y4 + 64 = y4 + 16y2 + 64 - 16y2
= (y2 + 8)2 - (4y)2
= (y2 + 8 - 4y)(y2 + 8 + 4y)
Ta có: \(A=\left(2+1\right)\left(2^2+1\right)\left(2^4+1\right)...\left(2^{64}+1\right)\)
\(A=\left(2^2-1\right)\left(2^2+1\right)\left(2^4+1\right)...\left(2^{64}+1\right)\)
\(A=\left(2^4-1\right)\left(2^4+1\right)...\left(2^{64}+1\right)\)
\(A=\left(2^{16}-1\right)...\left(2^{64}+1\right)\)
\(A=2^{64}-1\)
Ta thấy \(2^{64}-1< 2^{64}\)
Vậy \(A< B\)
Chúc bạn học tốt!
Từ a = b + 1 ta suy ra \(a-b=1\)
Do đó : \(\left(a+b\right)\left(a^2+b^2\right)\left(a^4+b^4\right)\left(a^8+b^8\right)...\left(a^{32}+b^{32}\right)=\left(a-b\right)\left(a+b\right)\left(a^2+b^2\right)\left(a^4+b^4\right)\left(a^8+b^8\right)...\left(a^{32}+b^{32}\right)=\left(a^2-b^2\right)\left(a^2+b^2\right)...\left(a^{32}+b^{32}\right)=\left(a^4-b^4\right)\left(a^4+b^4\right)...\left(a^{32}+b^{32}\right)\)
Tiếp tục thu gọn theo cách trên ta được đpcm.
\(A=1.\left(x+y\right)\left(x^2+y^2\right)...\left(x^{64}+y^{64}\right)\)
\(=\left(x-y\right)\left(x+y\right)\left(x^2+y^2\right)...\left(x^{64}+y^{64}\right)\)
\(=\left(x^2-y^2\right)\left(x^2+y^2\right)\left(x^4+y^4\right)...\left(x^{64}+y^{64}\right)\)
\(=\left(x^4-y^4\right)...\left(x^{64}+y^{64}\right)\)
\(=...=\left(x^{64}-y^{64}\right)\left(x^{64}+y^{64}\right)=x^{128}-y^{128}\)
2^64=16^16
2^64=2^8x8=256^8=256^4x2=4294967296^2
MÌnh giải ngắn gọn xúc tích
k cho mình nha!