$\frac{7}{19}+y=\frac{67}{76}$
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a: \(\Leftrightarrow x\cdot\dfrac{1}{19}=\dfrac{67}{76}-7=-\dfrac{465}{76}\)
hay \(x=-\dfrac{465}{4}\)
a) \(\frac{31}{23}-\left(\frac{7}{32}+\frac{8}{23}\right)=\frac{31}{23}-\frac{7}{32}-\frac{8}{23}=1-\frac{7}{32}=\frac{25}{32}\)
b) \(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)\)
\(=\frac{1}{3}+\frac{12}{67}+\frac{13}{41}-\frac{79}{67}+\frac{28}{41}\)
\(=\frac{1}{3}-\left(\frac{79}{67}-\frac{12}{67}\right)+\left(\frac{13}{41}+\frac{28}{41}\right)\)
\(=\frac{1}{3}-1+1=\frac{1}{3}\)
d) \(\frac{1}{7}.\frac{1}{3}+\frac{1}{7}.\frac{-1}{3}+\frac{17}{19}=\frac{1}{7}.\left(\frac{1}{3}-\frac{1}{3}\right)+\frac{17}{19}=\frac{17}{19}\)
e) \(\frac{3}{5}.\frac{7}{9}+\frac{7}{5}.\frac{2}{9}=\frac{7}{5}.\left(\frac{3}{9}+\frac{2}{9}\right)=\frac{7}{5}.\frac{5}{9}=\frac{7}{9}\)
Trả lời
b)(1/3+12/67+13/41)-(79/67-28/41)
=1/3+12/67+13/41-79/67+28/41
=1/3+(12/67-79/67)+(13/41+28/41)
=1/3+(-67/67)+41/41
=1/3+(-1)+1
=1/3+0
=1/3.
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{41}\\{19}\end{array}}\\\hline{\,\,\,60}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{67}\\{\,\,3}\end{array}}\\\hline{\,\,\,70}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{76}\\{14}\end{array}}\\\hline{\,\,\,90}\end{array}\)
1) \(19=\frac{38}{2}=\frac{76}{4}=\frac{95}{5}\)
2) \(1=\frac{3}{3}=\frac{9}{9}=\frac{1000}{1000}\)
~~ Học tốt ~~
`7/19+y=67/76`
`=>y=67/76-7/19`
`=>y=67/76-28/76`
`=>y=39/76`
\(\dfrac{7}{19}+y=\dfrac{67}{76}\)
\(y=\dfrac{67}{76}-\dfrac{7}{19}=\dfrac{39}{76}\)