So sánh A và B :
a,A=20/39+22/27+18/43 B=14/39+22/29+18/41
b,A=3/83+7/84, B=7/83+3/84
3 like cho ai làm được
So sánh A và B :
a,A=20/39+22/27+18/43 B=14/39+22/29+18/41
3 like cho ai làm được
xét A và B, ta thấy:
20/39>14/39
22/27>22/29
18/43<18/41
Ta có: 20/39+22/27>14/39+22/29
2012^2013+2013^2013<2013^2013+2013^2014
So sánh A và B :
a,A=20/39+22/27+18/43,B=14/39+22/29+18/41
b,A=3/8^3+7/8^4,B=7/8^3+3/8^4
c,A=10^7+5/10^7-8,B=10^8+6/10-7
d,A=10^1992+1/10^1991+1,B=10^1993+1/10^1992+1
so sánh
a= 20/39 + 22/27 + 18/43
b= 14/39 +22/29 +18/41
Ta thấy :
\(\frac{20}{39}>\frac{14}{39}\)
\(\frac{22}{27}>\frac{22}{29}\)
\(\frac{18}{43}< \frac{18}{41}\)
\(\Rightarrow\frac{20}{39}+\frac{22}{27}+\frac{18}{43}>\frac{14}{39}+\frac{22}{29}+\frac{18}{41}\)
=> A > B
so sánh A và B :
A = \(\frac{20}{39}+\frac{22}{27}+\frac{18}{43}\), B = \(\frac{14}{39}+\frac{22}{29}+\frac{18}{41}\)
ta có 20/39 > 14/39
22/27 > 22/29
18/43 < 18/41
=> 20/39+22/27+18/43 > 14/39+22/29+18/41
ta có 20/39 > 14/39
22/27 > 22/29
18/43 < 18/41
=> 20/39+22/27+18/43 > 14/39+22/29+18/41
Bằng dấu lớn ( > ) bạn nhé!^-^
Chúc bạn học tốt nha!^-^
So sánh A và B:
A=20/39+22/27+18/43 ; B=14/39+22/29+18/41
so sanh a va b
a, A=20/39 +22/27 + 18/43 B=14/39 +22/29+18/41
b, A=3/8^3 + 7/8^4 B= 7/8^3 + 3/8^4
so sánh \(A=\frac{20}{39}+\frac{22}{27}+\frac{18}{43};B=\frac{14}{39}+\frac{22}{29}+\frac{18}{41}\)
so sánh A và B ( giải rõ ra giùm mk nhé, ai nhanh & chính xác nhất mk nhất định sẽ k)
\(A=\frac{20}{39}+\frac{22}{27}+\frac{18}{43}\)\(B=\frac{14}{39}+\frac{22}{29}+\frac{18}{41}\)
SO SÁNH A VÀ B
a ) A=\(\dfrac{3}{8^3}+\dfrac{7}{^{ }8^4}\) B =\(\dfrac{7}{8^3}+\dfrac{3}{8^4}\)
b ) A=\(\dfrac{20}{39}+\dfrac{22}{27}+\dfrac{18}{43}\) B=\(\dfrac{14}{39}+\dfrac{22}{29}+\dfrac{18}{41}\)
a, Ta có:
A= \(\dfrac{3}{8^3}+\dfrac{7}{8^4}=\dfrac{3}{8^3}+\dfrac{3}{8^4}+\dfrac{4}{8^4}\)
B= \(\dfrac{7}{8^3}+\dfrac{3}{8^4}=\dfrac{3}{8^3}+\dfrac{4}{8^3}+\dfrac{3}{8^4}\)
Vì \(\dfrac{4}{8^4}< \dfrac{4}{8^3}\) nên A < B.
b, Ta có:
\(\dfrac{20}{39}>\dfrac{14}{39}\)
\(\dfrac{22}{27}>\dfrac{22}{29}\)
\(\dfrac{18}{43}< \dfrac{18}{41}\)
\(\Rightarrow\)\(\dfrac{20}{39}+\dfrac{22}{27}+\dfrac{18}{43}>\dfrac{14}{39}+\dfrac{22}{29}+\dfrac{18}{41}\)
Hay A > B