Tính : A = \(\frac{-5}{9}\times\frac{13}{28}-\frac{13}{28}\times\frac{4}{9}\)
Những câu hỏi liên quan
Chọn dấu " "=", " \( \ne \) " thích hợp cho dấu “?” :
a) \(\frac{{28}}{9} \cdot 0,7 + \frac{{28}}{9} \cdot 0,5\) ? \(\frac{{28}}{9} \cdot (0,7 + 0,5)\);
b) \(\frac{{36}}{{13}}:4 + \frac{{36}}{{13}}:9\) ? \(\frac{{36}}{{13}}:(4 + 9)\).
a)
\(\frac{{28}}{9} \cdot 0,7 + \frac{{28}}{9} \cdot 0,5 = \frac{{28}}{9}.\left( {0,7 + 0,5} \right)\)
b)
\(\begin{array}{l}\frac{{36}}{{13}}:4 + \frac{{36}}{{13}}:9\\ = \frac{{36}}{{13}}.\frac{1}{4} + \frac{{36}}{{13}}.\frac{1}{9}\\ = \frac{{36}}{{13}}.\left( {\frac{1}{4} + \frac{1}{9}} \right)\\ = \frac{{36}}{{13}}.\frac{{13}}{{36}} = 1\end{array}\)
\(\begin{array}{l}\frac{{36}}{{13}}:(4 + 9)\\ = \frac{{36}}{{13}}:13\\ = \frac{{36}}{{13}}.\frac{1}{{13}}\\ = \frac{{36}}{{169}}\end{array}\)
Suy ra \(\frac{{36}}{{13}}:4 + \frac{{36}}{{13}}:9\) \( \ne \) \(\frac{{36}}{{13}}:(4 + 9)\).
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1.Thực hiện phép tính:(hepl me)a)frac{-3}{5}+frac{28}{5}timesleft(frac{43}{56}+frac{5}{24}-frac{21}{63}right)b)frac{5}{7}timesfrac{11}{18}+frac{3}{7}timesfrac{5}{18}+frac{4}{9}c)frac{-3}{4}times5frac{3}{13}-0,75timesfrac{36}{13}d)6frac{5}{12}:2frac{3}{4}-11frac{1}{4}timesleft(frac{1}{3}-frac{1}{5}right)e)left(frac{3}{5}+0,415-frac{3}{200}right)times2frac{2}{3}times0,25
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\(\)1.Thực hiện phép tính:(hepl me)
a)\(\frac{-3}{5}\)+\(\frac{28}{5}\)\(\times\)\(\left(\frac{43}{56}+\frac{5}{24}-\frac{21}{63}\right)\)
b)\(\frac{5}{7}\times\frac{11}{18}+\frac{3}{7}\times\frac{5}{18}+\frac{4}{9}\)
c)\(\frac{-3}{4}\times5\frac{3}{13}-0,75\times\frac{36}{13}\)
d)\(6\frac{5}{12}:2\frac{3}{4}-11\frac{1}{4}\times\left(\frac{1}{3}-\frac{1}{5}\right)\)
e)\(\left(\frac{3}{5}+0,415-\frac{3}{200}\right)\times2\frac{2}{3}\times0,25\)
Bài làm :
a)\(=-\frac{3}{5}+\frac{28}{5}\times\frac{9}{14}=-\frac{3}{5}+\frac{18}{5}=3\)
b)\(=\frac{55}{126}+\frac{5}{42}+\frac{4}{9}=1\)
c)\(=-\frac{51}{13}-\frac{27}{13}=-6\)
d)\(=\frac{7}{3}-11\frac{1}{4}\times\frac{2}{15}=\frac{7}{3}-\frac{3}{2}=\frac{5}{6}\)
e)\(=1\times\frac{8}{3}\times0,25=\frac{2}{3}\)
a) \(\frac{4}{15}\times\frac{7}{9}+\frac{4}{15}\times\frac{2}{9}\)
b)\(\frac{13}{19}\times\frac{23}{11}-\frac{13}{19}\times\frac{8}{11}-\frac{13}{19}\times\frac{4}{11}\)
Giúp mình với nhé!
\(a.\) \(\frac{4}{15}.\frac{7}{9}+\frac{4}{15}.\frac{2}{9}\)
\(=\frac{4}{15}\left(\frac{7}{9}+\frac{2}{9}\right)\)
\(=\frac{4}{15}.\frac{9}{9}\)
\(=\frac{4}{15}.1\)
\(=\frac{4}{15}\)
\(b.\) \(\frac{13}{19}.\frac{23}{11}-\frac{13}{19}.\frac{8}{11}-\frac{13}{19}.\frac{4}{11}\)
\(=\frac{13}{19}\left(\frac{23}{11}-\frac{8}{11}-\frac{4}{11}\right)\)
\(=\frac{13}{19}.\frac{11}{11}\)
\(=\frac{13}{19}.1\)
\(=\frac{13}{19}\)
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a)4/15 x(7/9+2/9)=4/15x1=4/15
b)13/19x(23/11-8/11-4/11)13/19x1=13/19
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A) \(\frac{4}{15}x\frac{7}{9}+\frac{4}{15}x\frac{2}{9}\)
\(=\frac{28}{135}+\frac{8}{135}\)
\(=\frac{36}{135}=\frac{4}{15}\)
B) \(\frac{13}{19}x\frac{23}{11}-\frac{13}{19}x\frac{8}{11}-\frac{13}{19}x\frac{4}{11}\)
\(=\frac{299}{209}-\frac{104}{209}-\frac{52}{209}\)
\(=\frac{143}{209}\)
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Tìm x, biết:
\(x=\left(2-\frac{5}{3}+\frac{7}{6}-\frac{9}{10}+\frac{11}{15}-\frac{13}{21}+\frac{15}{28}-\frac{17}{36}+\frac{19}{45}\right)\times\frac{5}{3}\)
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Tính bằng cách thuận tiện
\(\frac{12}{23}\times\frac{9}{28}+\frac{11}{23}\times\frac{9}{28}=\)
\(3+\frac{1}{9}+\frac{3}{9}+2+\frac{5}{9}+3+2=\)
Câu 1:\(\frac{12}{23}\times\frac{9}{28}+\frac{11}{23}\times\frac{9}{28}\)
\(=\frac{9}{28}\times\left(\frac{12}{23}+\frac{11}{23}\right)\)
\(=\frac{9}{28}\times\frac{23}{23}\)
\(=\frac{9}{28}\times1\)
\(=\frac{9}{28}\)
Câu 2:
\(3+\frac{1}{9}+\frac{3}{9}+2+\frac{5}{9}+3+2\)
\(=\left(3+2+2+3\right)+\left(\frac{1}{9}+\frac{3}{9}+\frac{5}{9}\right)\)
\(=10+\frac{9}{9}\)
\(=10+1\)
\(=11\)
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\(\frac{12}{23}x\frac{9}{28}+\frac{11}{23}x\frac{9}{28}=\)\(\left(\frac{12}{23}+\frac{11}{23}\right)x\frac{9}{28}\)\(=\) \(1x\frac{9}{28}=\frac{9}{28}\)
\(3+\frac{1}{9}+\frac{3}{9}+2+\frac{5}{9}+3+2\)\(=\) \(\left(\frac{1}{9}+\frac{3}{9}+\frac{5}{9}\right)+\left(3+2+3+2\right)\)\(=\) \(1+3+2+3+2=\)\(11\)
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\(\frac{12}{23}\times\frac{9}{28}+\frac{13}{23}\times\frac{9}{28}=\left(\frac{12}{23}+\frac{13}{23}\right)\times\frac{9}{28}\)
\(=\) \(\frac{25}{23}\times\frac{9}{28}\)
\(=\frac{225}{664}\)
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\(A=5,3:\left(5\frac{5}{28}-2\frac{13}{36}+1\frac{16}{63}\right)\)
\(B=\left(\frac{19}{10}\times\frac{19}{10}+\frac{39}{2}:\frac{13}{3}\right)\times\left(\frac{62}{75}-\frac{12}{75}\right)\)
Tính.
a) $\frac{7}{9} \times \frac{{15}}{{28}} \times \frac{9}{7}$
b) $\frac{9}{{32}} \times \left( {\frac{2}{3} \times \frac{{14}}{{21}}} \right)$
a) $\frac{7}{9} \times \frac{{15}}{{28}} \times \frac{9}{7} = (\frac{7}{9} \times \frac{9}{7}) \times \frac{{15}}{{28}} = 1 \times \frac{{15}}{{28}} = \frac{{15}}{{28}}$
b) $\frac{9}{{32}} \times \left( {\frac{2}{3} \times \frac{{14}}{{21}}} \right) = \frac{9}{{32}} \times \left( {\frac{2}{3} \times \frac{2}{3}} \right) = \frac{9}{{32}} \times \frac{4}{9} = \frac{{36}}{{288}} = \frac{1}{8}$
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Cho biểu thức A= \(\frac{2}{1}\times\frac{4}{3}\times\frac{6}{5}\times\frac{8}{7}\times\frac{10}{9}\times...\times\frac{100}{99}\)Chứng minh rằng 12<A<13
1.Thực hiện phép tính: a)frac{-3}{5}+frac{28}{5}left(frac{43}{56}+frac{5}{24}-frac{21}{63}right)b)frac{5}{7}timesfrac{11}{18}+frac{3}{7}timesfrac{5}{18}+frac{4}{9} c)frac{-3}{4}times5frac{3}{13}-0,75timesfrac{36}{13}d)6frac{5}{12}:2frac{3}{4}-11frac{1}{4}timesleft(frac{1}{3}-frac{1}{5}right)e) left(frac{3}{5}+0,415-frac{3}{200}right).2frac{2}{3}.0,25
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1.Thực hiện phép tính: a)\(\frac{-3}{5}\)+\(\frac{28}{5}\)\(\left(\frac{43}{56}+\frac{5}{24}-\frac{21}{63}\right)\)b)\(\frac{5}{7}\)\(\times\)\(\frac{11}{18}\)+\(\frac{3}{7}\)\(\times\)\(\frac{5}{18}\)+\(\frac{4}{9}\) c)\(\frac{-3}{4}\)\(\times\)\(5\frac{3}{13}\)-0,75\(\times\)\(\frac{36}{13}\)d)\(6\frac{5}{12}\):\(2\frac{3}{4}\)-\(11\frac{1}{4}\times\left(\frac{1}{3}-\frac{1}{5}\right)\)
e) \(\left(\frac{3}{5}+0,415-\frac{3}{200}\right).2\frac{2}{3}.0,25\)