\(\frac{50}{25}\)+\(\frac{4}{5}\)=?
\(\frac{\frac{8}{5}:\left(\frac{8}{5}.\frac{5}{4}\right)}{\frac{16}{25}-\frac{1}{25}}+\frac{1:\frac{4}{7}}{\left(\frac{50}{9}-\frac{9}{4}\right).\frac{36}{17}}+0,6.0,5:\frac{2}{5}\)
8/5:(8/5.5/4) / 16/25-1/25 + 1:4/7 / (50/9-9/4).36/17) + 0,6.0,5:2/5
= 8/5:8/5:5/4 / 3/5 + 7/4 / 50/9.36/17-9/4.36/17 + 0,3.5/2
= 4/5:3/5 + 7/4 / 200/17-81/17 + 3/10.5/2
= 4/5.5/3 + 7/4 / 119/17 + 3/4
= 4/3 + 7/4 : 7 + 3/4
= 4/3 + 4 + 3/4
= 16/12 + 48/12 + 9/12
= 73/12
☆★☆★☆
\(\frac{\frac{\frac{2}{5}}{4}}{\frac{\frac{5}{25}}{50}}=?\)
nhầm
\(\frac{\frac{\frac{2}{5}}{4}}{\frac{\frac{5}{25}}{50}}=\frac{\frac{\frac{2}{5}}{4}}{10}=\frac{\frac{2}{25}}{2}=\frac{4}{25}\)
\(\frac{\frac{\frac{2}{5}}{4}}{\frac{\frac{5}{25}}{50}}=?\)
\(\frac{\frac{\frac{2}{5}}{4}}{\frac{\frac{5}{25}}{50}}=\frac{\frac{2}{5}:4}{\frac{5}{25}:50}=\frac{\frac{2}{5}.\frac{1}{4}}{\frac{5}{25}.\frac{1}{50}}=\frac{\left(\frac{1}{10}\right)}{\left(\frac{1}{250}\right)}=\frac{1}{10}:\frac{1}{250}=\frac{250}{10}=25\)
\(\frac{\frac{\frac{2}{5}}{4}}{\frac{5}{\frac{25}{50}}}=?\)
\(\frac{\frac{\frac{2}{5}}{4}}{\frac{5}{\frac{25}{50}}}=\frac{\frac{2}{5}:4}{5:\frac{25}{50}}=\frac{\frac{2}{5}.\frac{1}{4}}{5.\frac{50}{25}}=\frac{\left(\frac{1}{10}\right)}{10}=\frac{1}{10}:10=\frac{1}{10}.\frac{1}{10}=\frac{1}{100}\)
Chú ý: dấu gạch ngang viết dài hơn để phân biệt tử số và mẫu số của phân số
50+\(\frac{50}{3}+\frac{25}{3}+\frac{20}{4}+\frac{10}{3}+\frac{100}{67}\)
tính nhanh:\(\frac{\left(\frac{1}{2}+0,25+\frac{1}{4}\right)+\left(\frac{1}{8}+\frac{3}{2}+\frac{1}{8}+\frac{25}{100}\right)+\left(0,75+\frac{1}{5}+50\%+\frac{1}{4}+0,55+\frac{45}{100}\right)}{1x2x3}\)
Tính tổng:
\(50+\frac{50}{3}+\frac{25}{3}+\frac{30}{4}+\frac{10}{3}+\frac{100}{6.7}+...+198.99\)
Tính tổng:
\(50+\frac{50}{3}+\frac{25}{3}+\frac{30}{4}+\frac{10}{3}+\frac{100}{6.7}+...+198
.
99\)
Tìm x biết :
a)\(\frac{2}{3}x-50\%x-\left(-\frac{4}{5}\right):1\frac{3}{5}=-0,12\)\(+1\frac{3}{25}\)
b)\(\left(-1\frac{1}{6}+\frac{2}{3}-\frac{3}{4}\right):x+\left(-1\frac{11}{12}\right).1\frac{21}{23}=-6\frac{1}{3}\)
c)\(50\%x-\frac{1}{3}x-\left(\frac{-2}{3}\right)^2.\left(-1\frac{1}{8}\right)=-119\frac{3}{4}+120\frac{5}{6}\)