Các bạn ơi, giúp mình với! Mình đang cần câu này gấp
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a: 6/5-2/3=18/15-10/15=8/15
b: 9/7-5/8=72/56-35/56=37/56
c: 7/6-3/4=14/12-9/12=5/12
d: 9/8-8/9=81/72-64/72=17/72
e: 7/5-7/6=7(1/5-1/6)=7/30
f: 3/4-2/5=15/20-8/20=7/20
g: 4/7-5/6=24/42-35/42=-11/41
i: 6/13-5/11=66/143-65/143=1/143
k: 1-4/5=1/5
m: 2-5/9=18/9-5/9=13/9
n: 3-9/5=15/5-9/5=6/5
p: 4-3/4=16/4-3/4=13/4
a) \(\dfrac{6}{5}-\dfrac{2}{3}=\dfrac{18}{15}-\dfrac{10}{15}=\dfrac{8}{15}\)
b) \(\dfrac{9}{7}-\dfrac{5}{8}=\dfrac{72}{56}-\dfrac{35}{56}=\dfrac{37}{56}\)
c) \(\dfrac{7}{6}-\dfrac{3}{4}=\dfrac{28}{24}-\dfrac{18}{24}=\dfrac{10}{24}=\dfrac{5}{12}\)
d) \(\dfrac{9}{8}-\dfrac{8}{9}=\dfrac{81}{72}-\dfrac{64}{72}=\dfrac{17}{72}\)
e) \(\dfrac{7}{5}-\dfrac{7}{6}=\dfrac{42}{30}-\dfrac{35}{30}=\dfrac{7}{30}\)
h) \(\dfrac{4}{7}-\dfrac{5}{6}=\dfrac{24}{42}-\dfrac{35}{42}=-\dfrac{11}{42}\)
i) \(\dfrac{6}{13}-\dfrac{5}{11}=\dfrac{66}{143}-\dfrac{65}{143}=\dfrac{1}{143}\)
k) \(1-\dfrac{4}{5}=\dfrac{5}{5}-\dfrac{4}{5}=\dfrac{1}{5}\)
m) \(2-\dfrac{5}{9}=\dfrac{18}{9}-\dfrac{5}{9}=\dfrac{13}{9}\)
n) \(3-\dfrac{9}{5}=\dfrac{15}{5}-\dfrac{9}{5}=\dfrac{6}{5}\)
p) \(4-\dfrac{3}{4}=\dfrac{16}{4}-\dfrac{3}{4}=\dfrac{13}{4}\)
b: Tọa độ giao điểm là:
\(\left\{{}\begin{matrix}\dfrac{1}{2}x-5=-\dfrac{3}{2}x-1\\y=\dfrac{1}{2}x-5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x=4\\y=\dfrac{1}{2}x-5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=-4\end{matrix}\right.\)
Đặt A = 1/2+1/4+1/8+1/18+1/32+1/64+1/128+1/256
=> 2A = 1+1/2+1/4+1/8+1/18+1/32+1/64+1/128
=> 2A - A = 1 - 1/256
=> A = 255/256 nhé!
b: =45/8+1/2=45/8+4/8=49/8
c: =7/2-1/20=70/20-1/20=69/20
d: =5/4+3/10=25/20+6/20=31/20
Nửa chu vi hcn là:
\(\dfrac{5}{2}:2=\dfrac{5}{4}\left(m\right)\)
Chiều dài hcn là:
\(\left(\dfrac{5}{4}+\dfrac{1}{4}\right):2=\dfrac{3}{4}\left(m\right)\)
Chiều rộng hcn là:
\(\dfrac{5}{4}-\dfrac{3}{4}=\dfrac{1}{2}\left(m\right)\)
Nửa chu vi hcn là : 5/2 : 2 = 5/4
Chiều dài hcn là : ( 5/4 + 1/4 ) : 2 = 3/4
Chiều rộng hcn là : 5/4 - 3/4 = 1/2