31 tháng 3 2022 lúc 18:05
Các câu hỏi tương tự
\(\left(\dfrac{7}{8}-\dfrac{3}{4}\right).\)\(\dfrac{1}{3}-\dfrac{2}{7}.\left(3,5\right)^2\)
18 tháng 2 2022 lúc 14:29
\(\dfrac{-1}{8}+\dfrac{-5}{8}\)
\(\dfrac{-3}{7}+\dfrac{5}{7}\)
\(\dfrac{3}{5}+\dfrac{-7}{4}\)
\(\dfrac{-2}{3}+\dfrac{1}{5}\)
\(\dfrac{-2}{13}+\dfrac{-5}{26}\)
\(\dfrac{-4}{7}+\dfrac{1}{3}\)
Bài 1: Thực hiện phép tínha) 1-dfrac{1}{2}+dfrac{1}{3}b) dfrac{2}{5}+dfrac{3}{5}:dfrac{9}{10}c) dfrac{7}{11}.dfrac{3}{4}+dfrac{7}{11}.dfrac{1}{4}+dfrac{4}{11}d) left(dfrac{3}{4}+0,5+25%right).2dfrac{2}{3}Bài 2:text{Tìm x}a) x+dfrac{1}{2}2b) 75%x-dfrac{1}{2}-1dfrac{1}{4}c) left|x-dfrac{2}{5}right|+dfrac{7}{10}3
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Bài 1: Thực hiện phép tính
a) \(1-\dfrac{1}{2}+\dfrac{1}{3}\)
b) \(\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}\)
c) \(\dfrac{7}{11}.\dfrac{3}{4}+\dfrac{7}{11}.\dfrac{1}{4}+\dfrac{4}{11}\)
d) \(\left(\dfrac{3}{4}+0,5+25\%\right).2\dfrac{2}{3}\)
\(Bài 2:\text{Tìm x}\)
a) \(x+\dfrac{1}{2}=2\)
b) \(75\%x-\dfrac{1}{2}=-1\dfrac{1}{4}\)
c) \(\left|x-\dfrac{2}{5}\right|+\dfrac{7}{10}=3\)
A= ( -6,17 + \(3\dfrac{5}{9}\) - \(2\dfrac{36}{97}\)) . (\(\dfrac{1}{3}\) - 0,25 - \(\dfrac{1}{12}\))
B= \(\dfrac{0,5-\dfrac{3}{17}}{\dfrac{5}{6}-\dfrac{5}{17}}\) + \(\dfrac{0,5-\dfrac{1}{3}-0,2}{\dfrac{7}{5}+\dfrac{7}{3}-3,5}\)
31 tháng 5 2021 lúc 10:17
\(\text{|}\dfrac{7}{5}x+\dfrac{2}{3}\text{|}\text{=}\text{|}\dfrac{4}{3}x-\dfrac{1}{4}\text{|}\)
12 tháng 5 2021 lúc 16:06
dfrac{-7}{x}text{}dfrac{-21}{x-34} dfrac{4-x}{-5}text{}dfrac{-5}{4-x} dfrac{3}{x+2}text{}dfrac{5}{2x+1} dfrac{1}{2}text{}dfrac{x+1}{3x} dfrac{-3}{x+1}text{}dfrac{4}{2-2x}
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\(\dfrac{-7}{x}\text{=}\dfrac{-21}{x-34}\) \(\dfrac{4-x}{-5}\text{=}\dfrac{-5}{4-x}\)
\(\dfrac{3}{x+2}\text{=}\dfrac{5}{2x+1}\) \(\dfrac{1}{2}\text{=}\dfrac{x+1}{3x}\)
\(\dfrac{-3}{x+1}\text{=}\dfrac{4}{2-2x}\)
12 tháng 3 2022 lúc 14:25
Tính bằng cách hợp lý:a,dfrac{2}{3}+left(dfrac{5}{7}+dfrac{-2}{3}right) b,left(dfrac{-1}{4}+dfrac{5}{8}right)+dfrac{-3}{8}c,dfrac{7}{5}.dfrac{8}{19}+dfrac{7}{5}.dfrac{12}{19}-dfrac{7}{5}.dfrac{1}{19}d,6dfrac{3}{10}-left(3dfrac{4}{7}+2dfrac{3}{10}right)e,left(31,12-5,97right)-left(-68,88+4,03right)h,3,7.left(-10,56right)+3,7.110,56
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Tính bằng cách hợp lý:
\(a,\dfrac{2}{3}+\left(\dfrac{5}{7}+\dfrac{-2}{3}\right)\)
\(b,\left(\dfrac{-1}{4}+\dfrac{5}{8}\right)+\dfrac{-3}{8}\)
\(c,\dfrac{7}{5}.\dfrac{8}{19}+\dfrac{7}{5}.\dfrac{12}{19}-\dfrac{7}{5}.\dfrac{1}{19}\)
\(d,6\dfrac{3}{10}-\left(3\dfrac{4}{7}+2\dfrac{3}{10}\right)\)
\(e,\left(31,12-5,97\right)-\left(-68,88+4,03\right)\)
\(h,3,7.\left(-10,56\right)+3,7.110,56\)
Tính hợp lí:
g) \(\dfrac{-3}{4}+\dfrac{2}{7}+\dfrac{-1}{4}+\dfrac{3}{5}+\dfrac{5}{7}\)
h) \(\dfrac{7}{19}.\dfrac{8}{11}+\dfrac{7}{19}.\dfrac{3}{11}-\dfrac{12}{19}\)
i) \(19\dfrac{5}{8}:\dfrac{7}{2013}-26\dfrac{5}{8}:\dfrac{7}{2013}\)
k) \(\dfrac{-5}{12}.\dfrac{2}{11}+\dfrac{-5}{12}.\dfrac{9}{11}+\dfrac{5}{12}\)
4 tháng 3 2022 lúc 8:17
Tính:a) dfrac{-7}{8} . dfrac{3}{5} - dfrac{2}{5} . dfrac{7}{8} + 3dfrac{7}{8}b) -1,6 : ( 1 + dfrac{2}{3} )c) dfrac{6}{7} + dfrac{5}{8} : 5 - dfrac{3}{16} . ( -2 )^2d) dfrac{1^2}{1.2} . dfrac{2^2}{2.3} . dfrac{3^2}{3.4} . dfrac{4^2}{4.5}
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Tính:
a) \(\dfrac{-7}{8}\) . \(\dfrac{3}{5}\) - \(\dfrac{2}{5}\) . \(\dfrac{7}{8}\) + \(3\dfrac{7}{8}\)
b) -1,6 : ( 1 + \(\dfrac{2}{3}\) )
c) \(\dfrac{6}{7}\) + \(\dfrac{5}{8}\) : 5 - \(\dfrac{3}{16}\) . ( -2 )\(^2\)
d) \(\dfrac{1^2}{1.2}\) . \(\dfrac{2^2}{2.3}\) . \(\dfrac{3^2}{3.4}\) . \(\dfrac{4^2}{4.5}\)