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a) y = 5/14 : 6/7
y = 5/12
vậy y = 5/12
b) y = 4/9 x 2/3
y = 8/27
vậy t = 8/27
c) y = 1/2 - 3/10
y = 1/5
vậy y = 1/5
d) y = 5/6 - 1/3
y = 1/2
vậy y = 1/2
a) y : 4/11 x 3/5 = 27/4
y : 4/11 = 27/4 : 3/5
y : 4/11 = 45/4
y = 45/4 x 4/11
y = 45/11
b) y + 7/2 - 5/9 = 14/3
y + 7/2 = 14/3 + 5/9
y + 7/2 = 47/9
y = 47/9 - 7/2
y = 31/18
a) y : 4/11 x 3/5 = 27/4
y : 4/11 = 27/4 : 3/5
y : 4/11 = 45/4
y = 45/4 x 4/11
y = 45/11
b) y + 7/2 - 5/9 = 14/3
y + 7/2 = 14/3 + 5/9
y + 7/2 = 47/9
y = 47/9 - 7/2
y = 31/18
\(a,\frac{42}{25}:\frac{y}{5}=\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}:\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}\times\frac{5}{6}\)
\(\frac{y}{5}=\frac{7}{5}\)
\(\Leftrightarrow5y=7.5\)
\(5y=35\)
\(y=7\)
7/6 - 3/5 : 6
= 7/6 - 3/5 x 1/6
= 7/6 - 1/10
= 70/60 - 6/60
= 64/60
= 16/15
2/7 x 3 - y = 5/14
6/7 - y = 5/14
y = 6/7 - 5/14
y = 12/14 - 5/14
y = 7/14
A) \(\frac{4}{5}\)x\( y\)=\(\frac{5}{7}:\frac{3}{14}=\frac{10}{3}\)
\(\Rightarrow y=\frac{10}{3}:\frac{4}{5}=\frac{10}{3}.\frac{5}{4}=\frac{25}{6}\)
B) \(\Rightarrow\frac{22}{5}:y=\frac{44}{5}:\frac{5}{2}=\frac{44}{5}.\frac{2}{5}=\frac{88}{25}\)
\(\Rightarrow y=\frac{22}{5}:\frac{88}{25}=\frac{22}{5}.\frac{25}{88}=\frac{5}{4}\)
\(a,y-\dfrac{3}{4}=\dfrac{5}{12}:\dfrac{10}{3}\\ \Rightarrow a,y-\dfrac{3}{4}=\dfrac{5}{12}.\dfrac{3}{10}\\ \Rightarrow y-\dfrac{3}{4}=\dfrac{1}{8}\\ \Rightarrow y=\dfrac{1}{8}+\dfrac{3}{4}\\ \Rightarrow y=\dfrac{7}{8}\\ b,\dfrac{1}{3}\times\left(\dfrac{2}{5}+\dfrac{3}{10}\right):\dfrac{14}{9}=\dfrac{1}{3}\times\left(\dfrac{4}{10}+\dfrac{3}{10}\right):\dfrac{14}{9}=\dfrac{1}{3}\times\dfrac{7}{10}\times\dfrac{9}{14}=\dfrac{3}{20}\)
Bài 1. Tính rồi rút gọn:
a) 3/4 : 2/7 = 3/4 x 7/2 = 21/8
b) 3 : 3/5 = 3/1 x 5/3 = 15/3 = 5
c) 6/11 : 2/3 = 6/11 x 3/2 = 18/22 = 9/11
d) 15/4 : 5 = 15/4 x 1/5 = 15/20 = 3/4
Bài 2. Tìm y:
a) 6/7 x y = 5/14
y = 5/14 : 6/7
y = 5/14 x 7/6
y = 35/84
b) y : 2/3 = 4/9
y = 4/9 x 2/3
y = 8/27
1.
a.3/4 : 2/7 = 21/8
b. 3 : 3/5 = 5
c.6/11 : 2/3 = 9/11
d. 15/4 : 5 = 3/4
Tự ghi lại đề
Bài 1 :
\(\frac{2}{19}+\frac{4}{5}+1\frac{7}{9}+\frac{1}{5}\)
\(=\frac{2}{19}+1\frac{7}{9}+\left(\frac{4}{5}+\frac{1}{5}\right)\)
\(=\frac{2}{19}+1\frac{7}{9}+1\)
\(=\frac{493}{171}\)
\(\frac{1}{11}+\frac{2}{11}+\frac{3}{11}+\frac{4}{11}+\frac{5}{11}+\frac{6}{11}+\frac{7}{11}+\frac{8}{11}+\frac{9}{11}+\frac{10}{11}\)
\(=\left(\frac{1}{11}+\frac{10}{11}\right)+\left(\frac{2}{11}+\frac{9}{11}\right)+\left(\frac{3}{11}+\frac{8}{11}\right)+\left(\frac{4}{11}+\frac{7}{11}\right)+\left(\frac{5}{11}+\frac{6}{11}\right)\)
\(=1+1+1+1+1\)
\(=5\)
Bài 2 :
y : (23 + 27) = 9 1000 : (y x 25) = 8
y : 50 = 9 y x 25 = 1000 : 8
y = 9 x 50 y x 25 = 125
y = 450 y = 125 : 25
133 : (190 : y) = 7 y = 5
190 : y = 133 : 7 450 : (y + 42) = 9
190 : y = 19 y + 42 = 450 : 9
y = 190 : 19 y + 42 = 50
y = 10 y = 50 - 42
y = 8
Mk trả lời thiếu, chờ 1 lát
a) 3,7 x y + 5,28 = 14,9
3,7 x y= 9,62
y = 9,62 : 3,7
y = 2,6