\(\dfrac{a}{b}:\dfrac{1}{2}+\dfrac{2}{7}=\dfrac{5}{7}\)
\(\Leftrightarrow\dfrac{a}{b}:\dfrac{1}{2}=\dfrac{3}{7}\)
\(\Leftrightarrow\dfrac{a}{b}=\dfrac{3}{7}\cdot\dfrac{1}{2}=\dfrac{3}{14}\)
\(\dfrac{3}{5}+\dfrac{a}{b}=5\) \(\dfrac{a}{b}-\dfrac{4}{7}=\dfrac{5}{6}\) \(\dfrac{2}{3}\) x \(\dfrac{a}{b}=\dfrac{3}{5}\)
\(\dfrac{a}{b}:\dfrac{2}{7}=3+\dfrac{2}{3}\) \(\dfrac{7}{5}-\dfrac{a}{b}=\dfrac{2}{5}:2\)
\(\dfrac{3}{5}:\dfrac{a}{b}=\dfrac{2}{7}\) ÉT O ÉT
Tìm phân số \(\dfrac{a}{b}\):
\(\dfrac{2}{7}\) x \(\dfrac{a}{b}\) + \(\dfrac{a}{b}\) x \(\dfrac{5}{7}\) = \(\dfrac{5}{7}\)
các bạn làm nhanh giúp mik nhé! mik cảm ơn
bài 1 :
a) \(\dfrac{2}{5}+\dfrac{3}{8}=\) b)\(\dfrac{7}{6}-\dfrac{2}{3}=\) c)\(\dfrac{5}{9}\times6\) d)\(\dfrac{8}{5}:\dfrac{4}{7}=\)
bài 2:
a) \(\dfrac{4}{5}+\) x =\(\dfrac{5}{6}\) b)x : \(\dfrac{7}{10}=5\)
bài 3 : hai xe ô tô chở được tất cả 16 tấn 8 tạ hàng . Xe ô tô thứ nhất chở được nhiều hơn xe ô tô thứ hai 2 tấn 6 tạ hàng . Hỏi mỗi xe chở được bao nhiêu tạ hàng
bài 4 :
145 \(\times\) 69 + 22 x 145 +145 x 8 + 145 =
Tìm x, biết:
a) x - 2 = \(\dfrac{7}{15}\)
b) \(\dfrac{9}{20}\) + x = \(\dfrac{2}{5}\) + \(\dfrac{3}{20}\)
A,\(\dfrac{3}{5}+\dfrac{1}{6}\)
B,\(4+\dfrac{2}{5}\)
C,\(\dfrac{25}{12}-\dfrac{7}{6}\)
D,\(\dfrac{9}{7}-\dfrac{7}{6}\)
E,\(\dfrac{3}{7}\) x \(\dfrac{2}{5}\)
a.\(\dfrac{2}{7}\) x \(\dfrac{4}{3}\) + \(\dfrac{2}{6}\)
B.\(\dfrac{4}{7}\) : 2 + \(\dfrac{4}{7}\)
C.\(\dfrac{1}{3}+\dfrac{3}{4}-\dfrac{1}{5}:\dfrac{2}{3}\)
a,\(\dfrac{2}{3}\)x\(\dfrac{5}{2}\):\(\dfrac{9}{5}\)
b,\(\dfrac{1}{3}\)x\(\dfrac{1}{4}\)+\(\dfrac{5}{6}\)
c,\(\dfrac{1}{2}\)-\(\dfrac{7}{8}\):\(\dfrac{7}{4}\)
d,\(\dfrac{6}{5}\)-\(\dfrac{4}{5}\)x\(\dfrac{3}{2}\)
tìm x:
a) \(\dfrac{24}{35}\) - x = \(\dfrac{2}{7}\)
b) x - \(\dfrac{5}{6}\) = \(\dfrac{7}{8}\)
c) x - \(\dfrac{11}{5}\) = \(\dfrac{2}{5}\) : \(\dfrac{2}{3}\)
(giải chi tiết hộ mình)
a \(\dfrac{3}{7}\)+\(\dfrac{3}{4}\)-\(\dfrac{1}{2}\)=
b \(\dfrac{6}{11}\)+\(\dfrac{2}{9}\)x12=
c \(\dfrac{5}{7}\)-\(\dfrac{8}{5}\):4=
