so sánh 3/4....5/7
so sánh 3/7(3/7)^19 và [(-3/7)^5]^4so sánh 3/7(3/7)^19 và [(-3/7)^5]^4
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So sánh
-6 / 7 , 4/5 , 5/6, 8/7 , 3/-4 , 7/-3
so sánh
7/5; 4/13; 2/13; 1/18; 7/3; 4/5; 7/4
So sánh :
\(4^2.2^3.....7^5+6^4\)
so sánh: 4/5 và 3/7 ; 11/15 và 12/16 ; -3/7 và -4/9 ; -5/8 và 4/-7
4/5 > 3/7
11/15 < 12/6
-3/7 < -4/9
-5/8 < 4/-7
Câu 11: Trong các phép so sánh 2 phân số sau đây, phép so sánh nào sai?
A. -2 < -4/3 B. -2/3 > -4/7 C. 1/3 > 1/5 D. 3 > 9/4
So sánh 8^5 và 3•4^7
8⁵ = (2³)⁵ = 2¹⁵ = 2.2¹⁴
3.4⁷ = 3.(2²)⁷ = 3.2¹⁴
Do 2 < 3 nên 2.2¹⁴ < 3.2¹⁴
Vậy 8⁵ < 3.4⁷
\(8^5=2^{15}=2.2^{14}\)
\(3.4^7=3.2^{14}>2.2^{14}\)
\(\Rightarrow8^5< 3.4^7\)
So sánh:
A = 3/7 x (-3)/7^19 và B = [(-3/4)^5]^4
so sánh a và b
A=4/7+5+3/7 mũ 2+ 5/7 mũ ba+6/ 7 mũ 4
B=5/ 7 mũ 3+6/ 7 mũ 2+5/7 mũ 4+4/7+5
so sánh 3 căn 7 và 4 căn 5
Lời giải:
$3\sqrt{7}=\sqrt{3^2.7}=\sqrt{63}$
$4\sqrt{5}=\sqrt{4^2.5}=\sqrt{80}$
Mà $63<80$ nên $3\sqrt{7}< 4\sqrt{5}$