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a) ( 2/5 + 3/5) + 7/8
= 5/5 +7/8
= 1+ 7/8
=15/8 ( tính lại hộ mk nha, sợ ko đúng)
b)( 19/11 + 3/11 ) + 5/13
= 22/11 +5/13
= 2 + 5/13
= ...( bn tính nốt nha, vì mk ko có nháp ở đây )
k nha!!!
a) (2/5 + 7/8) + 3/5
= 2/5 + 7/8 + 3/5
= (2/5 + 3/5) + 7/8
= 1 + 7/8
= \(1\frac{7}{8}\)
b) 19/11 + (5/13 + 3/11)
= 19/11 + 5/13 + 3/11
= (19/11 + 3/11) + 5/13
= 2 + 5/13
= \(2\frac{5}{13}\)
a) \(\frac{47}{3}:3-\frac{37}{3}:3+\frac{5}{3}=\left(\frac{47}{3}-\frac{37}{3}\right):3+\frac{5}{3}\)
\(=\frac{10}{6}+\frac{5}{3}=\frac{10}{3}\)
b) \(\frac{3}{5}:\frac{7}{9}.\frac{7}{9}+\frac{7}{5}:2=\frac{3}{5}+\frac{7}{10}=\frac{13}{10}\)
a, \(=\left(\dfrac{4}{7}+\dfrac{3}{7}\right)+\left(\dfrac{3}{5}+\dfrac{3}{5}\right)=1+\dfrac{6}{5}=\dfrac{5+6}{5}=\dfrac{11}{5}\)
\(a,\dfrac{47}{3}:3-\dfrac{37}{3}:3+\dfrac{5}{3}=\dfrac{1}{3}\times\left(\dfrac{47}{3}-\dfrac{37}{3}\right)+\dfrac{5}{3}=\dfrac{10}{9}+\dfrac{5}{3}=\dfrac{10}{9}+\dfrac{15}{9}=\dfrac{25}{9}\)
\(b,\dfrac{3}{5}:\dfrac{7}{9}\times\dfrac{7}{9}:2=\dfrac{27}{35}\times\dfrac{7}{18}=\dfrac{3}{10}\)
\(a)\frac{3}{5}\times\frac{2}{5}+\frac{3}{4}\times\frac{3}{5}\)
\(=\frac{3}{5}\times\left(\frac{2}{5}+\frac{3}{4}\right)\)
\(=\frac{3}{5}\times\left(\frac{8}{20}+\frac{15}{20}\right)\)
\(=\frac{3}{5}\times\frac{23}{20}\)
\(=\frac{69}{100}\)
\(b)\frac{5}{9}\times\frac{7}{3}\times\frac{9}{5}\)
\(=\left(\frac{5}{9}\times\frac{9}{5}\right)\times\frac{7}{3}\)
\(=1\times\frac{7}{3}\)
\(=\frac{7}{3}\)
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!
\(a)\frac{4}{9}+\frac{3}{8}+\frac{5}{8}=\frac{4}{9}+(\frac{3}{8}+\frac{5}{8})=\frac{4}{9}+1=\frac{4+9}{9}=\frac{13}{9}\)
\(b)\frac{3}{7}+\frac{2}{3}+\frac{4}{7}=(\frac{3}{7}+\frac{4}{7})+\frac{2}{3}=1+\frac{2}{3}=\frac{3+2}{3}=\frac{5}{3}\)
\(a,127\times23+127\times43+127\times33+127\)
\(=127\times23+127\times43+127\times33+127\times1\)
\(=127\times\left(23+43+33+1\right)\)
\(=127\times100\)
\(=12700\)
\(b,\dfrac{5}{4}\times\dfrac{2}{3}+\dfrac{5}{4}\times\dfrac{7}{3}+\dfrac{7}{5}\)
\(=\dfrac{5}{4}\times\left(\dfrac{2}{3}+\dfrac{7}{3}\right)+\dfrac{7}{5}\)
\(=\dfrac{5}{4}\times3+\dfrac{7}{5}\)
\(=\dfrac{15}{4}+\dfrac{7}{5}\)
\(=\dfrac{75}{20}+\dfrac{28}{20}\)
\(=\dfrac{103}{20}\)
a) 127(23+43+33+1)
= 127.100
=12700
b) \(\dfrac{5}{4}.\left(\dfrac{2}{3}+\dfrac{7}{3}\right)+\dfrac{7}{5}\)
=\(\dfrac{15}{4}+\dfrac{7}{5}\)
= \(\dfrac{103}{20}\)