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\(A=\left(-\frac{5}{11}\right).\frac{7}{15}+\frac{11}{-5}.\frac{30}{33}\)
\(A=-\frac{7}{33}+-2\)
\(A=-\frac{73}{33}\)
[ A] = -2
Ta có : \(C=\left(1+\frac{11}{13}\right).\left(1+\frac{11}{28}\right).\left(1+\frac{11}{45}\right)......\left(1+\frac{11}{220}\right)\)
\(=\frac{24}{13}.\frac{39}{28}.\frac{56}{45}......\frac{231}{220}\)
\(=\frac{2.12}{1.13}.\frac{3.13}{2.14}.\frac{4.14}{3.15}......\frac{11.21}{10.22}\)
\(=\frac{2.12.3.13.4.14.....11.21}{1.13.2.14.3.15.....10.22}\)
\(=\frac{\left(2.3.4.....11\right).\left(12.13.14.....21\right)}{\left(1.2.3.....10\right).\left(13.14.15.....22\right)}\)
\(=\frac{11.12}{1.22}=\frac{12}{1.2}=6\)
Vậy C = 6
11/13-(5/42-x)= 243/364
5/42-x=243/364- 11/13
5/42-x= -5/28
x=5/42-(-5/28)
x=25/84
chúc bạn học giỏi
\(\frac{11}{13}-\left(\frac{5}{42}-x\right)=-\left(\frac{5}{28}-\frac{11}{13}\right)\)
\(\frac{11}{13}-\frac{5}{42}+x=-\frac{5}{28}+\frac{11}{13}\)
=> \(x=-\frac{5}{28}+\frac{11}{13}-\frac{11}{13}+\frac{5}{42}\)
=> \(x=-\frac{5}{28}+\frac{5}{42}\)
=> \(x=-\frac{210}{1176}+\frac{140}{1176}=\frac{-70}{1176}=\frac{-5}{84}\)
các bạn ơi làm giùm mk nhá,ai nhanh nhất mk k cho
\(\left(-\frac{5}{9}\right).\frac{3}{11}+\left(-\frac{13}{28}\right).\frac{3}{11}\)
\(=\frac{3}{11}.\left(-\frac{5}{9}+\left(-\frac{13}{28}\right)\right)\)
\(=\frac{3}{11}.\frac{-257}{252}\)
\(=-\frac{257}{924}\)