so sánh
a= 20/39 + 22/27 + 18/43
b= 14/39 +22/29 +18/41
so sanh A=20/39+22/27+18/43 va B=14/39+22/29+18/41
giai mau giup minh voi
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
xet A va B ta thay:
20/39>14/39
22/27>22/29
18/43<18/41
vay A>B
So sanh AvaB
A=\(\dfrac{20}{39}+\dfrac{22}{27}+\dfrac{18}{43},B=\dfrac{14}{39}+\dfrac{22}{29}+\dfrac{18}{41}\)
Ta có: \(\dfrac{20}{39}>\dfrac{20}{41}>\dfrac{18}{41}\left(1\right)\)
\(\dfrac{22}{27}>\dfrac{22}{29}\left(2\right)\)
\(\dfrac{18}{43}=1-\dfrac{25}{43};\dfrac{14}{39}=1-\dfrac{25}{39}\)
Vì \(\dfrac{25}{43}< \dfrac{25}{39}\Rightarrow1-\dfrac{25}{43}>1-\dfrac{25}{39}\Rightarrow\dfrac{18}{43}>\dfrac{14}{39}\left(3\right)\)
Từ \(\left(1\right);\left(2\right);\left(3\right)\) ta suy ra : A>B
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 = \(\dfrac{20}{39}+\dfrac{22}{27}+\dfrac{18}{43}\) và B = \(\dfrac{14}{39}+\dfrac{22}{29}+\dfrac{18}{41}\)
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 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
Bài 1: So sánh A và B
\(A=\frac{20}{39}+\frac{22}{27}+\frac{18}{43}\)
\(B=\frac{14}{39}+\frac{22}{29}+\frac{18}{41}\)
Giải chi tiết giúp mình nhé!
Cho hai phan so A=20/39 + 22/37 + 18/43 va B=14/39 + 22/29 + 18/41. So sanh A va B.
Ai nhanh nhat va dung nhat thi minh se tick va ket ban nhe!!!