5/16 x 24/11
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2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5
\(\dfrac{1}{5}+\dfrac{4}{11}+\dfrac{4}{5}+\dfrac{7}{11}=\left(\dfrac{1}{5}+\dfrac{4}{5}\right)+\left(\dfrac{4}{11}+\dfrac{7}{11}\right)=\dfrac{5}{5}+\dfrac{11}{11}=1+1=2\)
\(\dfrac{5}{6}+\dfrac{8}{24}+\dfrac{1}{6}+\dfrac{16}{24}=\dfrac{5}{6}+\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{2}{3}=\left(\dfrac{5}{6}+\dfrac{1}{6}\right)+\left(\dfrac{1}{3}+\dfrac{2}{3}\right)=\dfrac{6}{6}+\dfrac{3}{3}=1+1=2\)
a: =-9/11+2/3=-27/33+22/33=-5/33
b: =(16/29-13/29)+12/39-16/39
=3/29-4/39=1/1131
d: =(-111,82-8,18)+(13,3+16,7)=-120+30=-90
d: \(\dfrac{5}{16}-\dfrac{5}{24}=\dfrac{5\cdot3}{48}-\dfrac{5\cdot2}{48}=\dfrac{5}{48}\)
e: \(-\dfrac{24}{17}-\left(-\dfrac{7}{17}-\dfrac{1}{16}\right)\)
\(=-\dfrac{24}{17}+\dfrac{7}{17}+\dfrac{1}{16}=-1+\dfrac{1}{16}\)
\(=-\dfrac{15}{16}\)
f: \(\dfrac{-11}{6}+\dfrac{2}{5}+\dfrac{-1}{6}\)
\(=\left(-\dfrac{11}{6}-\dfrac{1}{6}\right)+\dfrac{2}{5}\)
\(=-2+\dfrac{2}{5}=\dfrac{-8}{5}\)
c) \(47-\left(x-15\right)=21\)
\(\Leftrightarrow x-15=47-21\)
\(\Leftrightarrow x-15=26\)
\(\Leftrightarrow x=26+15=41\)
d) \(-5-\left(24-x\right)=-11\)
\(\Leftrightarrow24-x=-5+11\)
\(\Leftrightarrow24-x=6\)
\(\Leftrightarrow x=24-6=18\)
\(x=-\dfrac{3}{16}+\dfrac{1}{4}=\dfrac{1}{16}\)
bạn viết rõ đề nhé
a) (44 x 52 x 60) : (11 x 13 x 15)
= (44 : 11) x ( 52 : 13) x (60 : 15)
= 4 x 4 x 4 = 64
d) 1 + 6 + 11 + 16 + ... + 46 + 51
Ta có : 1 + 6 + 11 + 16 + ... + 46 + 51 ( có 11 số )
= (51 + 1) x 11 : 2 = 286
\(a,=\dfrac{21}{48}+\dfrac{10}{48}=\dfrac{31}{48}\\ b,=\dfrac{44}{60}-\dfrac{25}{60}=\dfrac{19}{60}\)
Giải
a) 24 + (15-x) = 16
<=> 15-x=16-24
<=> 15-x=(-8)
<=> x = 15-(-8) => x = 23
b) 11 - (24-x) =
<=> 24-x= 11 - (-27)
<=> 24 - x = 38
<=> x = 24 - 38 => x = -14
c) |x-16| = 42
<=> x-16=42 và x-16=-42
<=> x = 42 + 16 ; x =-42+16
<=> x = 58 ; x = -26
d) 10-2|x| = (-2) . (-3)
<=> 10 - (-2) . (-3) = 2|x|
<=> 10 - 6 = 2|x|
<=> 2|x| = 4
<=> |x| = 4 : 2 = 2
=> x = 2 hoặc x = (-2)
A/ 24+(15-x)=16
(15-x)= 16- 24
(15-x)= - 18
x = 5 - (-18)
x = 23
B/ 11-(24-x)=(-3)3
(24-x)=11- 27
(24-x)= -16
x = 24 -(- 16)
x= 40
C/
\(\left|x-16\right|=42\hept{\begin{cases}x-16=42\\x-16=-42\end{cases}}\hept{\begin{cases}x=42+16\\x=-42+16\end{cases}}\hept{\begin{cases}x=58\\x=-26\end{cases}}\)
D/ 10-2|x|=(-2)x(-3)
10-2|x|=6
2|x|=10-6
2|x|=4
x=4:2
x=2
100/176 nha
bằng 120/176 nha
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