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- Tính giá trị biểu thức:
a) (2/5 x 25/29) + (3/5 x 25/29)
= (50/145) + (75/145)
= 125/145
b) (5/2 x 3/7) - (3/14 : 6/7)
= 15/14 - (3/14 x 7/6)
= 15/14 - 1/2
= (30/28) - (14/28)
= 16/28
= 4/7
c) (15/4 : 5/12) - (6/5 : 11/15)
= (15/4 x 12/5) - (6/5 x 15/11)
= 180/20 - 90/55
= 9 - 18/11
= (99/11) - (18/11)
= 81/11
= 7 4/11
- Tính giá trị biểu thức:
a) (2/3) + (20/21 x 3/2 x 7/5)
= 2/3 + (60/210)
= 2/3 + 2/7
= (14/21) + (6/21)
= 20/21
b) (5/17 x 21/32 x 47/24 x 0)
= 0
c) (11/3 x 26/7) - (26/7 x 8/3)
= (286/21) - (208/21)
= 78/21
= 3 9/21
= 3 3/7
- Tìm x:
a) (25/8) : x = 5/16
=> (25/8) x (16/5) = x
=> 4 = x
b) x + (7/15) = 6/15
=> x = (6/15) - (7/15)
=> x = -1/15
c) x : (28/49) = 7/12
=> x x (49/28) = 7/12
=> x = (7/12) x (28/49)
=> x = 1/2
- Tìm x:
a) 6 x x = (5/8) : (3/4)
=> 6x = (5/8) x (4/3)
=> 6x = 20/24
=> 6x = 5/6
=> x = (5/6) / 6
=> x = 5/36
câu,b,không,đủ,thông,tin,nhan,bạn.
\(\left(y-\frac{2}{5}\right):\frac{4}{3}=\frac{3}{8}\)
\(y-\frac{2}{5}=\frac{3}{8}.\frac{4}{3}\)
\(y-\frac{2}{5}=\frac{1}{2}\)
\(y=\frac{1}{2}+\frac{2}{5}\)
\(\Rightarrow y=\frac{9}{10}\)
\(y.\frac{5}{6}=\frac{1}{4}+\frac{1}{3}\)
\(y.\frac{5}{6}=\frac{7}{12}\)
\(y=\frac{7}{12}:\frac{5}{6}\)
\(y=\frac{7}{12}.\frac{6}{5}\)
\(\Rightarrow y=\frac{7}{10}\)
a ) \(\left(y-\frac{2}{5}\right):\frac{4}{3}=\frac{3}{8}\)
\(\left(y-\frac{2}{5}\right)=\frac{3}{8}\times\frac{4}{3}\)
\(y-\frac{2}{5}=\frac{1}{2}\)
\(y=\frac{1}{2}+\frac{2}{5}\)
\(y=\frac{5}{10}+\frac{4}{10}\)
\(y=\frac{9}{10}\)
Vậy \(y=\frac{9}{10}\)
b ) \(y\times\frac{5}{6}=\frac{1}{4}+\frac{1}{3}\)
\(y\times\frac{5}{6}=\frac{3}{12}+\frac{4}{12}\)
\(y\times\frac{5}{6}=\frac{7}{12}\)
\(y=\frac{7}{12}:\frac{5}{6}\)
\(y=\frac{7}{12}\times\frac{6}{5}\)
\(y=\frac{7}{10}\)
Vậy \(y=\frac{7}{10}\)
Chúc bạn học tốt !!!
1/3+1/6 x 4 = 1/3 + 2/ 3 = 3/3 = 1
11/3 + 1/6 x 2/5 -2 = 11/3 + 1/15 - 2 = 55/15 + 1/15 - 2 = 56/15 - 30/15 = 26/15
A = ( 6 : 3/5 - 7/6 * 6/7 ) : ( 21/5 * 10/11 + 57/11 )
A = ( 10 - 1 ) : ( 42/11 + 57/11)
A = 9 : 9
A = 1
B = 59 /10 : 3/2 - ( 7/3 * 9/2 - 2 * 7/3 ) : 7/4
B = 59/15 - ( 21/2 - 14/3 ) : 7/4
B = 59/15 - 35/6 : 7/4
B = 59/15 - 10/3
B = 3/5
1/3+1/6*4=1/3+2/3=1
11/3+1/6*2/5-2=11/3+1/30-2=37/10-2=17/10
câu a bằng 1
câu b bằng 17/10
chúc cậu hok gỏi
tk cho mk nha
\(\frac{6:\frac{3}{5}-1\frac{1}{6}\cdot\frac{6}{7}}{4\frac{1}{5}\cdot\frac{10}{11}+5\frac{2}{11}}=1\)
là đáp án C
c ban ei