Câu 4: Trang 50 sách VNEN toán 4
Tìm $x$:
$x+\frac{4}{5}=\frac{7}{5}$
$x-\frac{4}{3}=\frac{7}{4}$
$\frac{7}{4}-x=\frac{3}{14}$
Bài Làm:
$x+\frac{4}{5}=\frac{7}{5}$
$x$= $\frac{7}{5} -\frac{4}{5}$
$x$ =$\frac{3}{5}$
$x-\frac{4}{3} = \frac{7}{4}$
$x$ =$ \frac{7}{4} +\frac{4}{3}$
$x$ =$\frac{37}{12}$
$\frac{4}{7}- x =\frac{3}{14}$
$x$ = $\frac{4}{7}-\frac{3}{14}$
$x$ = $\frac{5}{14}$