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Ta có:
\(\frac{4}{3}+\frac{3}{7}:\frac{5}{14}\)
\(=\frac{4}{3}+\left(\frac{3}{7}:\frac{5}{14}\right)\)
\(=\frac{4}{3}+\left(\frac{3}{7}×\frac{14}{5}\right)\)
\(=\frac{4}{3}+\left(\frac{3×14}{7×5}\right)\)
\(=\frac{4}{3}+\left(\frac{3×7×2}{7×5}\right)\)
\(=\frac{4}{3}+\left(\frac{3×2}{5}\right)\)
\(=\frac{4}{3}+\frac{6}{5}\)
\(=\frac{4×5}{3×5}+\frac{6×3}{5×3}\)
\(=\frac{20}{15}+\frac{18}{15}\)
\(=\frac{20+18}{15}\)
\(=\frac{38}{15}\)
\(\frac{4}{3}+\frac{3}{7}\)\(:\frac{5}{14}\)
\(=\frac{4}{3}+\frac{3}{7}\times\frac{14}{5}\)
\(=\frac{4}{3}+\frac{6}{9}\)
\(=\frac{20}{15}+\frac{18}{15}\)
\(=\frac{38}{15}\)
a) Ta có: \(7\cdot\dfrac{3}{14}-\dfrac{1}{14}\)
\(=\dfrac{3}{2}-\dfrac{1}{14}\)
\(=\dfrac{21}{14}-\dfrac{1}{14}\)
\(=\dfrac{10}{7}\)
b) Ta có: \(\dfrac{3}{2}+\dfrac{7}{4}:\dfrac{5}{2}\)
\(=\dfrac{3}{2}+\dfrac{7}{4}\cdot\dfrac{2}{5}\)
\(=\dfrac{3}{2}+\dfrac{7}{10}\)
\(=\dfrac{15}{10}+\dfrac{7}{10}=\dfrac{22}{10}=\dfrac{11}{5}\)
Lời giải:
\(7\times \frac{3}{14}-\frac{1}{14}=\frac{7\times 3}{14}-\frac{1}{14}=\frac{21}{14}-\frac{1}{14}=\frac{21-1}{14}=\frac{20}{14}=\frac{2\times 10}{2\times 7}=\frac{10}{7}\)
\(\frac{3}{2}+\frac{7}{4}:\frac{5}{2}=\frac{3}{2}+\frac{7}{4}\times \frac{2}{5}=\frac{3}{2}+\frac{7\times 2}{4\times 5}=\frac{3}{2}+\frac{7\times 2}{2\times 2\times 5}\)
\(=\frac{3}{2}+\frac{7}{2\times 5}=\frac{3\times 5}{2\times 5}+\frac{7}{2\times 5}=\frac{3\times 5+7}{2\times 5}=\frac{22}{2\times 5}=\frac{2\times 11}{2\times 5}=\frac{11}{5}\)
a: =11/2*4*5/3
=22*5/3
=110/3
b: =30/12-3/12+20/12
=47/12
c: =28/15+5
=28/15+75/15
=103/15
2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
\(\dfrac{3}{14}+\dfrac{2}{7}=\dfrac{3}{14}+\dfrac{4}{14}=\dfrac{7}{14}=\dfrac{1}{2}\)
\(\dfrac{6}{5}-\dfrac{1}{4}=\dfrac{24}{20}-\dfrac{5}{20}=\dfrac{24-5}{20}=\dfrac{19}{20}\)
3/7 + 4/9 + 5/11 + 8/14 + 10/18 + 12/22
= 3/7 + 4/9 + 5/11 + 4/7 + 5/9 + 6/11
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 ) + ( 5/11 + 6/11 )
= 7/7 +9/9 + 11/11
= 1 + 1 + 1
= 3
tk mk nha , cảm ơn ạ , được ko á ?????????
3/7 + 4/9 + 5/11 + 8/14 + 10/18 + 12/22 = 3
\(\frac{4}{3}-\frac{14}{x}=\frac{2}{5}\)
\(\frac{14}{x}=\frac{4}{3}-\frac{2}{5}\)
\(\frac{14}{x}=\frac{14}{15}\)
\(\Rightarrow\)\(x=15\)
TL:
\(\frac{4}{3}\)- \(\frac{14}{x}\)= \(\frac{2}{5}\)
\(\frac{14}{x}\)= \(\frac{4}{3}\)- \(\frac{2}{5}\)
\(\frac{14}{x}\)= \(\frac{14}{15}\)
x = 15.
~HT~
= -9 nhaa
Bằng -9 nha bạn