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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NT
1
BD
28 tháng 8 2019
Giải :
\(B=\left[\left(-\frac{3}{7}\right)^5\right]^4\)
\(B=\left(-\frac{3}{7}\right)^{20}\)
\(A=\frac{3}{7}\cdot\left(\frac{3}{7}\right)^{19}\)
\(A=\left(\frac{3}{7}\right)^{20}\)
\(\Rightarrow A>B\)
[ hoq chắc ]
22 tháng 2 2022
Bài 1:
a: -8/12<0<-3/-4
b: -56/24<0<7/3
c: 4/25<1<15/13
=>-4/25>-15/13
Bài 2:
a: =-60/45=-4/3
b: =4/15-3/2-8/5=8/30-45/30-48/30=-85/30=-17/6
NN
2
1 tháng 3 2022
a: 3/5>-19/5
b: 8/7<8/3
c: 3/4=15/20
2/5=8/20
mà 15>8
nên 3/4>2/5
d: -3/5=-18/30
-4/6=-20/30
mà -18>-20
nên -3/5>-4/6
1 tháng 3 2022
a: 3/5>-19/5
b: 8/7<8/3
c: 3/4=15/20
2/5=8/20
mà 15>8
nên 3/4>2/5
d: -3/5=-18/30
-4/6=-20/30
mà -18>-20
nên -3/5>-4/6
14 tháng 4 2022
a: \(\dfrac{3}{5}-\dfrac{7}{4}=\dfrac{12}{20}-\dfrac{35}{20}=\dfrac{-23}{20}\)
b: \(\dfrac{4}{5}:\dfrac{-8}{15}=\dfrac{-4}{5}\cdot\dfrac{15}{8}=\dfrac{-60}{40}=\dfrac{-3}{2}\)
c: \(=7+\dfrac{5}{9}-2-\dfrac{3}{4}-3-\dfrac{5}{9}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
d: \(=\dfrac{-3}{7}\left(\dfrac{4}{19}+\dfrac{15}{19}\right)+\dfrac{5}{7}=\dfrac{2}{7}\)
UL
2
NN
1
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