\(\frac{13}{24}\times\frac{12}{13}\)

\(=\frac{12}{24}=\frac{1}{2}\)

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1 phần 2

bạn nhé

(12/7x4/13)+(12/14x14/26)+(6/7x2/13)

= 48/91       +         6/13     +      12/91

=               90/91       +        12/91

=                            102/91

         \(\frac{12}{9}x\frac{3}{7}+\frac{8}{3}x\frac{10}{14}\)

      \(=\frac{4}{3}x\frac{3}{7}+\frac{8}{3}x\frac{5}{7}\)

      \(=\frac{4}{7}+\frac{40}{21}\)

      \(=\frac{12}{21}+\frac{40}{21}\)

       \(=\frac{52}{21}\) 

Tham khảo nha !!! 

52/21

nhiều quá bạn ơi

12/14 + 15/20 + 6/7 + 3/4 

= ( 12/14 + 6/7 ) + ( 15/20 + 3/4 ) 

= ( 6/7 + 6/7 ) + ( 3/4 + 3/4 ) 

=      12/7 + 6/4 

=      48/28 + 42/28 

=         90/28 

=        45/14

Tham khảo nha !!! 

x = 0 ???

Đây là toán lớp 4?!

thì sao ??

thì sao ??

thì sao ??

thì sao ???

a, \(\frac{3}{4}\times\frac{4}{7}+\frac{5}{14}\)

\(=\frac{3}{7}+\frac{5}{14}=\frac{6}{14}+\frac{5}{14}=\frac{11}{14}\)

b, \(\frac{5}{14}+\frac{9}{7}\div\frac{3}{4}\)

\(=\frac{5}{14}+\frac{9}{7}\times\frac{4}{3}=\frac{5}{14}+\frac{12}{7}=\frac{5}{14}+\frac{24}{14}=\frac{29}{14}\)

c, \(\frac{12}{17}\div x=\frac{3}{5}\)

\(x=\frac{12}{17}\div\frac{3}{5}=\frac{12}{17}\times\frac{5}{3}=\frac{20}{17}\)

\(\frac{3}{4}X\frac{4}{7}+\frac{5}{14}\)

\(=\frac{3}{7}+\frac{5}{14}\)

\(=\frac{6}{14}+\frac{5}{14}\)

\(=\frac{11}{14}\)

\(\left(2.8x-32\right):\frac{2}{3}=90\)

\(2.8\cdot x-32=90\cdot\frac{2}{3}\)

\(\frac{14}{5}x-32=60\)

\(\frac{14}{5}x=60+32\)

\(\frac{14}{5}x=92\)

\(x=\frac{230}{7}\)

B , c , d tương tự

các bạn tích nhanh hộ mình nha 

\(\sqrt{\frac{1}{2}}\times\sqrt{\frac{6}{2}}\)

\(=\sqrt{\frac{1}{2}\times\frac{6}{2}}\)

\(=\sqrt{\frac{6}{4}}\)

\(=\sqrt{\frac{3}{2}}\)