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9×2/70×2=18/140
-3×7/20×7=-21/140
-15×10/14×10=-150/140
A) \(\frac{17}{320}\)VÀ \(\frac{-9}{80}\)
\(\frac{17}{320}\)
\(\frac{-9}{80}=\frac{-36}{320}\)
B) \(\frac{-7}{10}\)VÀ \(\frac{1}{33}\)
\(\frac{-7}{10}=\frac{-231}{330}\)
\(\frac{1}{33}=\frac{10}{330}\)
C) \(\frac{-5}{14};\frac{3}{20}\)VÀ \(\frac{9}{70}\)
\(\frac{-5}{14}=\frac{-50}{140}\)
\(\frac{3}{20}=\frac{21}{140}\)
\(\frac{9}{70}=\frac{18}{140}\)
D) \(\frac{10}{42}=\frac{5}{21};\frac{-3}{28}\)VÀ \(\frac{-55}{132}\)
\(\frac{5}{21}=\frac{220}{924}\)
\(\frac{-3}{28}=\frac{-99}{924}\)
\(\frac{-55}{132}=\frac{-385}{924}\)
CHÚC BN HỌC TỐT!!!!!
1) A = \(\frac{-15}{19}.\frac{23}{37}+\frac{14}{37}.\frac{15}{19}=\frac{15}{19}.\frac{-23}{37}+\frac{14}{37}.\frac{15}{19}=\frac{15}{19}.\left(\frac{-23}{37}+\frac{14}{37}\right)=\frac{15}{19}.\frac{-9}{37}=\frac{-135}{703}\)
\(a,\frac{6}{10}=\frac{3}{5};\frac{6}{16}=\frac{3}{8};-\frac{15}{20}=\frac{3}{4};-\frac{10}{30}=\frac{-1}{3}\)
\(b,\frac{42}{28}=\frac{3}{2};\frac{54}{-21}=-\frac{10}{7};-\frac{27}{33}=-\frac{9}{11};\frac{25}{14}=\frac{25}{14}\)
\(c,\frac{125}{1000}=\frac{1}{8};\frac{198}{126}=\frac{11}{7};\frac{3}{243}=\frac{1}{81};\frac{103}{2090}=\frac{103}{2090}\)
\(d,\frac{2.3}{9.14}=\frac{28}{3}\)
\(a,\)\(\frac{1}{2}.\left(\frac{2}{9}+\frac{3}{7}-\frac{5}{37}\right)\)
\(\Rightarrow\frac{1}{2}.\left(\frac{2.259}{2331}+\frac{3.333}{2331}-\frac{5.63}{2331}\right)\)
\(\Rightarrow\frac{1}{2}.\left(\frac{518}{2331}+\frac{999}{2331}-\frac{315}{2331}\right)\)
\(\Rightarrow\frac{1}{2}.\left(\frac{518+999-315}{2331}\right)\)
\(\Rightarrow\frac{1}{2}.\frac{1202}{2331}\)
\(\Rightarrow\frac{601}{2331}\)
\(b,\)\(\left(-\frac{5}{28}+1,75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)
\(\Rightarrow\frac{9}{5}:\left(-\frac{69}{20}\right)\)
\(=-\frac{12}{23}\)
\(c,\)\(\frac{1}{3}.\frac{1}{5}-\frac{7}{27}.\frac{36}{14}\)
\(=\frac{1}{15}-\frac{2}{3}\)
\(=\frac{1}{15}-\frac{10}{15}=-\frac{9}{15}=-\frac{3}{5}\)
\(d,\)\(70,5-528:\frac{15}{2}\)
\(=70,5-\frac{352}{5}\)
\(=\frac{1}{10}\)
19/140;-21/140;-50/140
5/21;-3/28;-5/12
chưa xong y b