(1/6 + 1/10 + 1/15) : (1/6 + 1/10 - 1/15)
tính giá trị của biểu thức (1/6+1/10+1/15):(1/6+1/10-1/15)
(1/6 + 1/10 + 1/15) :(1/6 +1/10-1/15)
(1/2-1/3+1/4-1/5):(1/4-1/6)
a: \(\left(\dfrac{1}{6}+\dfrac{1}{10}+\dfrac{1}{15}\right):\left(\dfrac{1}{6}+\dfrac{1}{10}-\dfrac{1}{15}\right)\)
\(=\dfrac{5+3+2}{30}:\dfrac{5+3-2}{30}\)
\(=\dfrac{10}{30}\cdot\dfrac{30}{6}\)
\(=\dfrac{10}{6}=\dfrac{5}{3}\)
b: \(\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{1}{5}\right):\left(\dfrac{1}{4}-\dfrac{1}{6}\right)\)
\(=\dfrac{30-20+15-12}{60}:\dfrac{3-2}{12}\)
\(=\dfrac{13}{60}\cdot\dfrac{12}{1}=\dfrac{13}{5}\)
(1/6 +1/10+1/15) / (1/6+1/10-1/15)
(1/2-1/3+1/4-1/5) / (1/4-1/6)
\(\frac{\frac{1}{6}+\frac{1}{10}+\frac{1}{15}}{\frac{1}{6}+\frac{1}{10}-\frac{1}{15}}=\frac{\frac{5+3+2}{30}}{\frac{5+3-2}{30}}=\frac{\frac{1}{3}}{\frac{1}{5}}=1\frac{2}{3}\)
\(\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}}{\frac{1}{4}-\frac{1}{6}}=\frac{\frac{30-20+15-12}{60}}{\frac{3-2}{12}}=\frac{\frac{13}{60}}{\frac{1}{12}}=2\frac{3}{5}\)
tíc nha mn, mình đang bị âm điểm
a ) 43/20 + 17/6 : ( 5/8 + 7/30 )
b ) ( 1/6 + 1/10 + 1/15 ) : ( 1/6 + 1/10 - 1/15 )
a) 43/20 + 17/6 : ( 150/240 + 210/240 )
= 43/20 + 17/6 : 360/240
= 43/20 + 17/6 : 3/2
= 43/20 + 34/18
= 774/360 + 612/360
= 1386/360
= 77/20
b)
= ( 5/30 + 3/30 + 2/30 ) : ( 5/30 + 3/30 - 2/30 )
= 10/30 : 0
= 1/3 : 0
=1/3
Đó là cách giải chi tiết va dễ hiểu nhất đó ^ - ^
tính giá trị của biểu thức
A (1/6 + 1/10 + 1/15 ) : (1/6+1/10-1/15) / (1/2-1/3+1/4-1/5) : (1/4-1/6)
B (3/20+1/2-1/15 )12/49 / 3 1/3 + 2/9
Dãy nào dưới đây gồm các phân số được sắp xếp theo thứ tự từ bé đến lớn:
(1 Point)
10/10 ; 14/15;6/15; 1/3
14/15;10/10;6/15; 1/3
1/3; 6/15; 10/10;14/15
1/3; 6/15;14/15; 10/10
\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right):\left(\frac{1}{6}+\frac{1}{10}-\frac{1}{15}\right)\)
=(5/30+3/30+2/30) : (5/30+3/30-2/30)
=10/30 : 5/30
=10/30 x 30/5
=2
!!! Hok tốt!!!
\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right):\left(\frac{1}{6}+\frac{1}{10}-\frac{1}{15}\right)\)
=\(\frac{10}{30}:\frac{6}{30}\)
\(=\frac{5}{3}\)
\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right):\left(\frac{1}{6}+\frac{1}{10}-\frac{1}{15}\right)\)
\(=\left(\frac{5}{30}+\frac{3}{30}+\frac{2}{30}\right):\left(\frac{5}{30}+\frac{3}{30}-\frac{2}{30}\right)\)
\(=\left(\frac{5+3+2}{30}\right):\left(\frac{5+3-2}{30}\right)\)
\(=\frac{8}{30}:\frac{6}{30}\)
\(=\frac{8}{30}\times\frac{30}{6}\)
\(=\frac{4}{1}\times\frac{1}{3}\)
\(=\frac{4}{3}\)
\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right)\div\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right)\))
\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right):\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right)=1\)
(1/6 + 1/10 + 1/15) : (1/6 +1/10 +1/15)=1
Chúc bạn học tốt!
các bn giúp mk nhé
a ( 1/6 + 1/10 + 1/15 ) : ( 1/6 + 1/10 - 1/15)
b ( 1/2 - 1/3 + 1/4 - 1/5 ) : ( 1/4 - 1/5)
a (1/6 + 1/10 + 1/15) : (1/6 + 1/10 - 1/15)
= ( 5/30 + 3/30 + 2/30) : (5/30 + 3/30 - 2/30)
= 1/3 : 1/6 = 1/3 x 6/1 = 6/3 = 2
b (1/2 - 1/3 + 1/4 - 1/5) : (1/4 - 1/5)
= (1/2 - 1/3 + 1/4 - 1/5) : (1/4 - 1/5)
= 1/2 - 1/3 = 1/6
a)
(1/6+1/10+1/15) : (1/6+1/10-1/15)
= (1/6+1/10): (1/6+1/10)
= 4/15:4/15
=1
~Hy
b)
(1/2-1/3 +1/4-1/5): (1/4-1/5)
= (1/2-1/3) :(1/4-1/5)
= 1/6:1
=1/6
~Hy