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\(\frac{6}{5}\)- \(\frac{5}{8}\)-\(\frac{3}{8}\)
= \(\frac{6}{5}\)- \(\left(\frac{5}{8}+\frac{3}{8}\right)\)
=\(\frac{6}{5}\)- \(\frac{8}{8}\)
=\(\frac{8}{40}\)
\(\frac{6}{5}\)\(-\) \(\frac{5}{8}\)\(-\) \(\frac{3}{8}\)
=\(\frac{6}{5}\)\(-\) \(\left(\frac{5}{8}-\frac{3}{8}\right)\)
= \(\frac{6}{5}\)\(-\)\(\frac{1}{4}\)
= \(\frac{24}{20}\)\(-\)\(\frac{5}{20}\)
= \(\frac{19}{20}\)
Tính bằng cách thuận tiện nhất
a,5*12*3*7/3*8*7*5
b, 2*5*4*6/4*3*5*7
Làm nhanh nha , mình đang cần gấp
a)
\(\frac{5.12.3.7}{3.8.7.5}=\frac{1.12.1.1}{1.8.1.10}=\frac{12}{8}=\frac{3}{2}\)
b)
\(\frac{2.5.4.6}{4.3.5.7}\frac{2.1.1.2.3}{1.1.1.7}=\frac{12}{7}\)
HOK TỐT!
\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)
\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)
\(=1+1\)
\(=2\)
\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)
\(=\)\(\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)
\(=\)\(1+1\)
\(=\)\(2\)
( 8/14 + 6/14 ) + ( 5/12 - 1/12 + 8/12 )
= 1 + ( 4/12 + 8/12 )
= 1 + 1 = 2
\(\frac{5}{6}-\frac{1}{2}+2\)
\(=\frac{1}{3}+\frac{2}{1}\)
\(=\frac{7}{3}\)
\(\frac{3}{9}+\frac{9}{15}+\frac{8}{12}\)
\(\frac{8}{12}=\frac{2}{3};\frac{3}{9}=\frac{1}{3};\frac{9}{15}=\frac{3}{5}\)
\(\frac{3}{9}+\frac{9}{15}+\frac{8}{12}=\left(\frac{2}{3}+\frac{1}{3}+\frac{3}{5}\right)\)
\(=1+\frac{3}{5}=\frac{8}{5}\)
\(\frac{4}{10}+\frac{12}{32}+\frac{9}{15}\)
\(\frac{4}{10}=\frac{2}{5};\frac{9}{15}=\frac{3}{5};\frac{12}{32}=\frac{3}{8}\)
\(\frac{4}{10}+\frac{12}{32}+\frac{9}{15}=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{3}{8}\)
\(=1+\frac{3}{8}=\frac{11}{8}\)
~ Ủng hộ nhé ~
\(\dfrac{5}{8}\) x 4 + \(\dfrac{5}{8}\) x \(\dfrac{4}{5}\)
= \(\dfrac{5}{8}\) x (\(4\) + \(\dfrac{4}{5}\) )
= \(\dfrac{5}{8}\) x \(\dfrac{24}{5}\) = 3
A) 2424 : 8 : 3
= 303 : 3
= 101
B) (360 x 25 x 12 ) : 24
= 360 x 25 x 12 : 24
= 360 : 24 x 25 x 12
= 15 x 300
= 4 500
C) ( 750 x 360 x 56 ) : ( 25 x 12 x 7 )
=>\(\frac{750x360x56}{25x12x7}\)
= \(30x30x8\)
= \(900x8\)
=\(7200\)
\(A=\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}+\frac{1}{6\times7}+\frac{1}{7\times8}\)
\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\)
\(=\frac{1}{2}-\frac{1}{8}\)
\(=\frac{3}{8}\)
Còn một câu hỏi nữa, làm sao để viết chữ phân số trong này thế?
12/5 - 3/5 - 5/8
= 12/5 - 1
= 7/5
\(\dfrac{12}{5}\) - \(\dfrac{5}{8}\) - \(\dfrac{3}{8}\)
= \(\dfrac{12}{5}\) - (\(\dfrac{5}{8}\) + \(\dfrac{3}{8}\))
= \(\dfrac{12}{5}\) - 1
= \(\dfrac{12}{5}\) - \(\dfrac{5}{5}\)
= \(\dfrac{7}{5}\)