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(5^2-1)(5^2+1)...(5^32+1)-5^64
=(5^4-1)....(5^32+1)-5^64
=(5^32-1)(5^32+1)-5^64
=5^64-1-5^64
=-1
\(B=24.\left(5^2+1\right)\left(5^4+1\right)......\left(5^{32}+1\right)-5^{64}\)
\(B=\left(5^2-1\right)\left(5^2+1\right)....\left(5^{32}+1\right)-5^{64}\)
\(B=\left(5^4-1\right).....\left(5^{32}+1\right)-5^{64}\)
\(B=\left(5^{32}-1\right)\left(5^{32}+1\right)-5^{64}\)
\(B=5^{64}-1-5^{64}\)
\(B=-1\)
Bài 2:
a: \(\left(a-b-2\right)^2-\left(2a-2b\right)\left(a-b-2\right)+a^2-2ab+b^2\)
\(=\left(a-b\right)^2-4\left(a-b\right)+4+\left(a-b\right)^2-2\left(a-b\right)\left(a-b-2\right)\)
\(=2\left(a-b\right)^2-4\left(a-b\right)+4-2\left[\left(a-b\right)^2-2\left(a-b\right)\right]\)
\(=2\left(a-b\right)^2-4\left(a-b\right)+4-2\left(a-b\right)^2+4\left(a-b\right)\)
\(=4\)
b: \(\left(2+1\right)\left(2^2+1\right)\cdot...\cdot\left(2^{256}+1\right)-1\)
\(=\left(2^2-1\right)\left(2^2+1\right)\left(2^4+1\right)\cdot...\cdot\left(2^{256}+1\right)-1\)
\(=\left(2^4-1\right)\left(2^4+1\right)\left(2^8+1\right)\cdot...\cdot\left(2^{256}+1\right)-1\)
\(=\left(2^8-1\right)\left(2^8+1\right)\left(2^{16}+1\right)\cdot...\cdot\left(2^{256}+1\right)-1\)
\(=\left(2^{16}-1\right)\left(2^{16}+1\right)\left(2^{32}+1\right)\cdot...\cdot\left(2^{256}+1\right)-1\)
\(=\left(2^{32}-1\right)\left(2^{32}+1\right)\left(2^{64}+1\right)\cdot...\cdot\left(2^{256}+1\right)-1\)
\(=\left(2^{64}-1\right)\left(2^{64}+1\right)\left(2^{128}+1\right)\left(2^{256}+1\right)-1\)
\(=\left(2^{128}-1\right)\left(2^{128}+1\right)\left(2^{256}+1\right)-1\)
\(=\left(2^{256}-1\right)\left(2^{256}+1\right)+1\)
\(=2^{512}-1+1=2^{512}\)
c: \(24\left(5^2+1\right)\left(5^4+1\right)\cdot...\cdot\left(5^{32}+1\right)-5^{64}\)
\(=\left(5^4-1\right)\left(5^4+1\right)\left(5^8+1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\)
\(=\left(5^8-1\right)\left(5^8+1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\)
\(=\left(5^{16}-1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\)
\(=\left(5^{32}-1\right)\left(5^{32}+1\right)-5^{64}\)
=-1
Giúp vs @@Phạm Hoàng GiangTrần Quốc LộcTrần Thị Hươnghattori heijiTRẦN MINH HOÀNGAn Nguyễn BáRibi Nkok NgokKien Nguyen
Trần Đăng NhấtHung nguyen
Sửa đề bài 1 : Rút gọn
a,\(\left(2+1\right)\left(2^2+1\right)\left(2^4+1\right).........\left(2^{32}+1\right)-2^{64}\)
\(626Q=\left(5^4+1\right)Q=5^{36}+5^{32}-\left(5^2-1\right)\left(5^2+1\right)626\left(5^8+1\right)\left(5^{16}+1\right)=5^{36}+5^{32}-\left(5^4-1\right)\left(5^4+1\right)\left(5^8+1\right)\left(5^{16}+1\right)=5^{36}+5^{32}-\left(5^8-1\right)\left(5^8+1\right)\left(5^{16}+1\right)=5^{36}+5^{32}-\left(5^{16}-1\right)\left(5^{16}+1\right)=5^{36}+5^{32}-5^{32}+1=5^{36}+1=\left(5^{12}+1\right)\left(5^{24}-5^{12}+1\right)=\left(5^4+1\right)\left(5^8-5^4+1\right)\left(5^{24}-5^{12}+1\right)\Rightarrow Q=\left(5^8-5^4+1\right)\left(5^{24}-5^{12}+1\right)\)
Giải:
1) B = 272 - 252 = (27 - 25)(27 + 25) = 20.52
Suy ra A<B, vì 202<20.52
2) D = 20032 - 1 = 20032 - 12 = (2003 - 1)(2003 + 1) = 2002.2004
Suy ra C = D.
3) Nhân (2-1) vào E, ta đươc: E = (2-1)(2+1)(22+1)(24+1)(28+1)(216+1)
Áp dụng lân lượt hằng đẳng thức số 3 (Hiệu hai bình phương) vào E, ta được kế quả:
E = 232-1
Suy ra E<F
4) Nhân (3-1) vào G, ta đươc: 2G = (3-1)(3+1)(32+1)(34+1)(38+1)(316+1)
Áp dụng lân lượt hằng đẳng thức số 3 (Hiệu hai bình phương) vào G, ta được kế quả:
2G = 332-1
Suy ra G = (332-1)/2
Mà (332-1)/2 < 332/2
Suy ra G<H
5)
Nhân 2 vào I, ta đươc: 2I = 2.12(52+1)(54+1)(58+1)...(532+1)
Áp dụng lân lượt hằng đẳng thức số 3 (Hiệu hai bình phương) vào I, ta được kế quả:
2I = 564-1
Suy ra I = (564-1)/2
Mà (564-1)/2 < 564-1
Suy ra I<K.
Chúc chị học tốt!
\(24\left(5^2+1\right)\left(5^4+1\right)\left(5^8+1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\\ =\left(5^2-1\right)\left(5^2+1\right)\left(5^4+1\right)\left(5^8+1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\\ =\left(5^4-1\right)\left(5^4+1\right)\left(5^8+1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\\= \left(5^8-1\right)\left(5^8+1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\\ =\left(5^{16}-1\right)\left(5^{16}+1\right)\left(5^{32}+1\right)-5^{64}\\ =\left(5^{32}-1\right)\left(5^{32}+1\right)-5^{64}\\ =5^{64}-1-5^{64}\\ =-1\)