So sánh:
1/3+1/30+1/32+1/35+1/45+1/47+1/50 với 1/2
K
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DT
1
23 tháng 3 2017
1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 < 7/14
1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 <1/14 +1/14 +1/14 +1/14 +1/14 +1/14 +1/14
dù 1/3>1/14 nhưng :1/30<1/14 1/32<1/14 ;1/35<1/14 ;1/45<1/14 ;1/47<1/14 ;1/50<1/14
nên: 1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 < 1/2
26 tháng 3 2020
Ta có: \(\frac{1}{32}< \frac{1}{30};\frac{1}{35}< \frac{1}{30}\)
=> \(\frac{1}{30}+\frac{1}{32}+\frac{1}{35}< \frac{1}{30}+\frac{1}{30}+\frac{1}{30}=\frac{1}{10}\)
\(\frac{1}{47}< \frac{1}{45};\frac{1}{50}< \frac{1}{45}\)
=> \(\frac{1}{45}+\frac{1}{47}+\frac{1}{50}< \frac{1}{45}+\frac{1}{45}+\frac{1}{45}=\frac{3}{45}=\frac{1}{15}\)
=> \(\frac{1}{3}+\frac{1}{30}+\frac{1}{32}+\frac{1}{35}+\frac{1}{45}+\frac{1}{50}< \frac{1}{3}+\frac{1}{10}+\frac{1}{15}=\frac{1}{2}\)
AQ
2
KL
26 tháng 7 2017
Ta có : 1/3 < 1/2
1/30 < 1/2
1/32 < 1/2
1/35 < 1/2
1/45 < 1/2
1/47 < 1/2
1/50 < 1/2
=> 1/3 + 1/30 + 1/32 + 1/35 + 1/45 + 1/47 + 1/50 < 1/2
@Ác Quỷ Bóng Tối
PT
26 tháng 7 2017
\(\dfrac{1}{3}+\dfrac{1}{30}+\dfrac{1}{32}+\dfrac{1}{35}+\dfrac{1}{45}+\dfrac{1}{47}+\dfrac{1}{50}< \dfrac{1}{2}\)
\(\Rightarrow\)\(\dfrac{1}{3}+\dfrac{1}{30}+\dfrac{1}{32}+\dfrac{1}{35}+\dfrac{1}{45}+\dfrac{1}{47}+\dfrac{1}{50}< \dfrac{7}{14}\)
\(\Rightarrow\dfrac{1}{3}+\dfrac{1}{30}+\dfrac{1}{32}+\dfrac{1}{35}+\dfrac{1}{45}+\dfrac{1}{47}+\dfrac{1}{50}< \dfrac{1}{14}+\dfrac{1}{14}+\dfrac{1}{14}+\dfrac{1}{14}+\dfrac{1}{14}+\dfrac{1}{14}+\dfrac{1}{14}\)
Dù \(\dfrac{1}{3}>\dfrac{1}{14}\) nhưng:
\(\dfrac{1}{30}< \dfrac{1}{14}\)
\(\dfrac{1}{32}< \dfrac{1}{14}\)
\(\dfrac{1}{35}< \dfrac{1}{14}\)
\(\dfrac{1}{45}< \dfrac{1}{14}\)
\(\dfrac{1}{47}< \dfrac{1}{14}\)
\(\dfrac{1}{50}< \dfrac{1}{14}\)
\(\Rightarrow\) \(\dfrac{1}{3}+\dfrac{1}{30}+\dfrac{1}{32}+\dfrac{1}{35}+\dfrac{1}{45}+\dfrac{1}{47}+\dfrac{1}{50}< \dfrac{1}{2}\)
LM
1
28 tháng 7 2017
1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 < 7/14
1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 <1/14 +1/14 +1/14 +1/14 +1/14 +1/14 +1/14
dù 1/3>1/14 nhưng :1/30<1/14 1/32<1/14 ;1/35<1/14 ;1/45<1/14 ;1/47<1/14 ;1/50<1/14
nên: 1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 < 1/2
6 tháng 4 2018
1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 < 7/14
1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 <1/14 +1/14 +1/14 +1/14 +1/14 +1/14 +1/14
dù 1/3>1/14 nhưng :1/30<1/14 1/32<1/14 ;1/35<1/14 ;1/45<1/14 ;1/47<1/14 ;1/50<1/14
nên: 1/3+1/30+1/32+1/35+1/45 +1/47 +1/50 < 1/2
TT
0
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