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\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}=\frac{27.100}{\frac{\left(2+18\right).9}{2}}=30\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}=\frac{26\left(108-12\right)}{\left(32-28\right).4}=\frac{26.96}{4.4}=156\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}=\frac{270.450+270.550}{\frac{\left(2+8\right).9}{2}}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{5.5}\)\(=\frac{48\left(700-450\right)}{25}=\frac{48.250}{25}=480\)
#ĐinhBa
bài 1
a) \(\frac{-3}{14}-\frac{5}{-14}=\frac{-3}{14}-\frac{-5}{14}\)
\(=\frac{-3}{14}+\frac{5}{14}\)
\(=\frac{2}{14}=\frac{1}{7}\)
b)\(\frac{-5}{4}-\frac{3}{4}=\frac{-5}{4}+\frac{-3}{4}\)
\(=\frac{-8}{4}=\frac{-2}{1}=-2\)
c)\(\frac{15}{6}-\frac{-10}{20}=\frac{15}{6}-\frac{-1}{2}\)
\(=\frac{15}{6}-\frac{-3}{6}=\frac{15}{6}+\frac{3}{6}\)
\(=\frac{18}{6}=3\)
Bài 2
a)\(\frac{36}{-35}-\frac{6}{35}=\frac{-36}{35}+\frac{-6}{35}\)
\(=\frac{-30}{35}=\frac{-6}{5}\)
b)\(\frac{-1}{21}-\frac{-1}{28}=\frac{-28}{588}-\frac{-21}{588}\)
\(=\frac{-28}{588}+\frac{21}{588}\)
\(=\frac{-7}{588}=\frac{-1}{84}\)
c)\(\frac{-3}{29}-\frac{16}{59}=\frac{-177}{1711}-\frac{464}{1711}\)
\(=\frac{-177}{1711}+\frac{464}{1711}\)
\(=\frac{-641}{1711}\)
k cho mk nha
theo mik phần c bài 1 bạn có thể rút gọn
15/6 thành 5/2 nha
nhưng các cách làm của bạn đều đúng nha
\(a,\frac{5}{16}:0,125-\left(2\frac{1}{4}-0,6\right)\cdot\frac{10}{11}\)
\(=\frac{5}{16}:\frac{1}{8}-\left(\frac{9}{4}-\frac{3}{5}\right)\cdot\frac{10}{11}\)
\(=\frac{5}{2}-\frac{33}{20}\cdot\frac{10}{11}\)
\(=\frac{5}{2}-\frac{3}{2}\)
\(=1\)
\(\frac{5}{16}:0,125-\left(2\frac{1}{4}-0,6\right).\frac{10}{11}\)
\(\Rightarrow\frac{5}{16}:\frac{125}{1000}-\left(\frac{9}{4}-\frac{6}{10}\right).\frac{10}{11}\)
\(\Rightarrow\frac{5}{16}:\frac{1}{8}-\left(\frac{9}{4}-\frac{3}{5}\right).\frac{10}{11}\)
\(\Rightarrow\frac{5}{16}.\frac{8}{1}-\left(\frac{45}{20}-\frac{12}{20}\right).\frac{10}{11}\)
\(\Rightarrow\frac{5}{2}-\frac{33}{20}.\frac{10}{11}\)
\(\Rightarrow\frac{5}{2}-\frac{3.1}{2.1}\)
\(\Rightarrow\frac{5}{2}-\frac{3}{2}=\frac{2}{2}=1\)
a) \(\frac{27.4500+135.550.2}{2+4+6+...+18}=\frac{270.450+270.550}{9.20:2}=\frac{270.1000}{90}=3000\)
b) \(\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{25}=\frac{48.250}{25}=480\)