Câu 4: Trang 105 toán VNEN 4 tập 2
Tim $x$:
$\frac{2}{9}+ x = 1$ $\frac{6}{7}-x=\frac{2}{3}$ $x-\frac{3}{2}=\frac{5}{6}$
$\frac{2}{5}\times x=\frac{2}{3}$ $\frac{2}{5}:x=\frac{1}{3}$ $x :\frac{5}{11}= 22$
Bài Làm:
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$\frac{2}{9}+ x = 1$ $x= 1 - \frac{2}{9}$ $x= \frac{9}{9}-\frac{2}{9}=\frac{7}{9}$ |
$\frac{6}{7}-x=\frac{2}{3}$ $x=\frac{6}{7}-\frac{2}{3}$ $x=\frac{18}{21}-\frac{14}{21}=\frac{4}{21}$ |
$x-\frac{3}{2}=\frac{5}{6}$ $x=\frac{5}{6}+\frac{3}{2}$ $x=\frac{5}{6}+\frac{9}{6}=\frac{15}{6}$ |
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$\frac{2}{5}\times x=\frac{2}{3}$ $x=\frac{2}{3}:\frac{2}{5}$ $x=\frac{2}{3}\times \frac{5}{2}=\frac{10}{6}$ |
$\frac{2}{5}:x=\frac{1}{3}$ $x=\frac{2}{5}:\frac{1}{3}$ $x=\frac{2}{5}\times 3=\frac{6}{5}$ |
$x :\frac{5}{11}= 22$ $x= 22 \times \frac{5}{11}$ $x=\frac{110}{11}$ |