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\(\dfrac{3}{7}\times x=\dfrac{1}{3}\)
\(x=\dfrac{1}{3}:\dfrac{3}{7}\)
\(x=\dfrac{7}{9}\)
\(x:\dfrac{6}{8}=\dfrac{2}{5}\)
\(x=\dfrac{2}{5}\times\dfrac{6}{8}\)
\(x=\dfrac{6}{20}=\dfrac{3}{10}\)
\(x-\dfrac{2}{3}=\dfrac{5}{6}\)
\(x=\dfrac{5}{6}+\dfrac{2}{3}\)
\(x=\dfrac{9}{6}=\dfrac{3}{2}\)
\(x-\dfrac{2}{5}-\dfrac{4}{35}=\dfrac{1}{7}\)
\(x=\dfrac{1}{7}+\dfrac{4}{35}+\dfrac{2}{5}\)
\(x=\dfrac{23}{35}\)
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a,
8 x 427 x 3 - 6 x 573 x 4
= 24 x 472 - 24 x 573
= 24 x (473 - 573)
b, tương tự
tuy nhiên với đề bài như vậy, k phù hợp với HS lớp 4
a) x=8/9 - 1/6
x= 13/18
b) x=7/10+1/6
x= 13/15
c) 5/2-x=3/4
-x=3/4 - 5/2
-x=-7/4
x=7/4
\(x-\frac{3}{4}=\frac{3}{8}\div6\)
\(x-\frac{3}{4}=\frac{1}{16}\)
\(x=\frac{1}{16}+\frac{3}{4}\)
\(x=\frac{13}{16}\)
a, \(\left(\frac{4}{9}.\frac{3}{7}\right).\frac{7}{4}=\frac{4}{9}\left(\frac{3}{7}.\frac{7}{4}\right)=\frac{4}{9}.\frac{3}{4}=\frac{3}{9}=\frac{1}{3}\)
b, \(\left(\frac{6}{5}.\frac{4}{5}\right).\frac{25}{16}=\frac{6}{5}\left(\frac{4}{5}.\frac{25}{16}\right)=\frac{6}{5}.\frac{5}{4}=\frac{6}{4}=\frac{3}{2}\)
c, \(\left(\frac{7}{8}.\frac{16}{9}\right).\frac{3}{14}=\frac{7}{8}\left(\frac{16}{9}.\frac{3}{14}\right)=\frac{7}{8}.\frac{8}{21}=\frac{7}{21}=\frac{1}{3}\)
( 4/9 x 3/7 ) x 7/4 = 4/9 x ( 3/7 x 7/4 ) =4/9 x 21/28 = 84/252
( 6/5 x 4/5 ) x 25/16 = ( 25/16 x 4/5 ) x 6/5 = 100/80 x 6/5 = 600/400
1) 1/3 x 1/2 x 3/7 = 1/6 x 3/7 = 1/14
2) 5/4 x 1/3 + 1/7 = 5/12 + 1/7 = 47/84
3) 8 x (8/9 - 2/3) = 8 x 2/9 = 16/9
4) 5/6 x 48/20 x 1/2 = 2 x 1/2 = 1
5) (2/5 + 3/4) x 8 = 23/20 x 8 = 46/5
6) 10 x (1/2 - 1/5) = 10 x 3/10 = 3
\(6\times x=\dfrac{5}{8}:\dfrac{3}{4}\)
\(6\times x=\dfrac{5}{8}\times\dfrac{4}{3}\)
\(6\times x=\dfrac{20}{24}\)
\(x=\dfrac{20}{24}:6\)
\(x=\dfrac{20}{24}\times\dfrac{144}{24}=\dfrac{5}{1}\times\dfrac{6}{6}\)
\(x=5\)
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6 \(\times\) \(x\) = \(\dfrac{5}{8}\) : \(\dfrac{3}{4}\)
6 \(\times\) \(x\) = \(\dfrac{5}{6}\)
\(x\) = \(\dfrac{5}{6}\) : 6
\(x\) = \(\dfrac{5}{36}\)