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\(\Leftrightarrow y\times\left(\dfrac{1}{7}+\dfrac{9}{21}+\dfrac{7}{3}\right)=\dfrac{5}{3}\)
\(\Leftrightarrow y\times\dfrac{61}{21}=\dfrac{5}{3}\)
\(\Leftrightarrow y=\dfrac{5}{3}:\dfrac{61}{21}=\dfrac{35}{61}\)
y x (1/7 +9/21 +7/3)= 5/3
y x 61/21 = 5/3
y = 5/3 : 61/21
y= 35/61
tk cho mk đi. mk giải cho nhưng tk cho mk trước đã
a) \(y+\frac{3}{4}=\frac{4}{5}\)
\(y=\frac{4}{5}-\frac{3}{4}\)
\(y=\frac{1}{20}\)
b) \(y-\frac{3}{11}=\frac{9}{22}\)
\(y=\frac{9}{22}-\frac{3}{11}\)
\(y=\frac{3}{22}\)
c) \(\frac{9}{2}-y=\frac{2}{9}\)
\(y=\frac{9}{2}-\frac{2}{9}\)
\(y=\frac{77}{18}\)
\(y+\frac{3}{4}=\frac{4}{5}\)
\(y=\frac{4}{5}-\frac{3}{4}\)
\(y=\frac{1}{20}\)
Vậy y = 1/20
\(y-\frac{3}{11}=\frac{9}{22}\)
\(y=\frac{9}{22}+\frac{3}{11}\)
\(y=\frac{15}{22}\)
Vậy y = 15/22
\(\frac{9}{2}-y=\frac{2}{9}\)
\(y=\frac{9}{2}-\frac{2}{9}\)
\(y=\frac{77}{18}\)
Vậy y = 77/18
a) 4 x 6 x 8 = 24 x 8 = 224
4 x 6 x 8 = 4 x 48 = 224
2 x 6 x 5 = 12 x 5 = 60
2 x 6 x 5 = 2 x 5 x 6 = 10 x 6 = 60
b) 3 x 9 x 7 = 27 x 7 = 189
3 x 9 x 7 = 3 x 63 = 189
4 x 7 x 3 = 28 x 3 = 84
4 x 7 x 3 = 4 x 21 = 84
a) y = 4/5-3/4 = 1/20
b) y = 9/22 + 3/11 =15/22
c)y = 9/2 - 2/9 = 77/18
Câu 10:
\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)
câu 11:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
a/ (y+2/9):7/4=11/7
y+2/9=11/7.7/4
y+2/9=11/4
y=11/4-2/9
y=91/36
\(\frac{y}{9}\)x\(\frac{2}{7}\)=\(\frac{2}{9}\)
\(\frac{y}{9}\)=\(\frac{2}{9}\):\(\frac{2}{7}\)
\(\frac{y}{9}\)=\(\frac{2}{9}\)x\(\frac{7}{2}\)
\(\frac{y}{9}\) =\(\frac{14}{18}\)
\(\Rightarrow\)\(\frac{y}{9}\) =\(\frac{7}{9}\)
\(\Rightarrow\) \(y\) = \(7\)
CHÚC BẠN HỌC TỐT(KẾT BẠN NHA)!!!