Bài 2: Cộng, trừ số hữu tỉ
Các câu hỏi tương tự
12 tháng 9 2021 lúc 14:54
1. Tìm x
\(2\dfrac{1}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}-\left(-\dfrac{4}{7}\right)\)
12 tháng 9 2021 lúc 15:08
1.Tìm x
a) \(1\dfrac{4}{5}=-0,15-x\)
b) \(-\dfrac{4}{7}-x=\dfrac{3}{5}-2x\)
c) \(\left(\dfrac{3}{8}-\dfrac{1}{5}\right)+\left(\dfrac{5}{8}-x\right)=\dfrac{1}{5}\)
29 tháng 6 2021 lúc 12:31
e) \(\dfrac{3}{3x}-\dfrac{3}{12}=\dfrac{4}{5}-\left(\dfrac{7}{x}-2\right)\)
f) \(\dfrac{1}{x-1}+\dfrac{-2}{3}\left(\dfrac{3}{4}-\dfrac{6}{5}\right)=\dfrac{5}{2-2x}\)
a)2x.(x-\(\dfrac{1}{7}\) ) =0
b) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
c) \(4\dfrac{5}{9}:2\dfrac{5}{18}-7< x< \left(3\dfrac{1}{5}:3,2+4,5.1\dfrac{31}{45}\right)\)
Tìm x biết:
a) \(x+\dfrac{1}{3}=\dfrac{3}{4}\) ; b) \(x-\dfrac{2}{5}=\dfrac{5}{7};\)
c) \(-x-\dfrac{2}{3}=-\dfrac{6}{7}\) ; d) \(\dfrac{4}{7}-x=\dfrac{1}{3}\)
bài 1 :
a)dfrac{3}{7} + ( -dfrac{5}{2} ) + ( dfrac{-3}{5} ) b) ( -dfrac{4}{3} ) + (-dfrac{2}{5} ) + (- dfrac{3}{2} )
c) dfrac{4}{5}- ( dfrac{-2}{7} ) - ( dfrac{7}{10} ) d ) dfrac{2}{3} - [(-dfrac{4}{7} ) - ( dfrac{1}{2} + dfrac{3}{8} )]
bài 2 : tìm x , biêt
a) x + dfrac{1}{3} dfrac{3}{4} ;...
Đọc tiếp
bài 1 :
a)\(\dfrac{3}{7}\) + ( -\(\dfrac{5}{2}\) ) + ( \(\dfrac{-3}{5}\) ) b) ( -\(\dfrac{4}{3}\) ) + (-\(\dfrac{2}{5}\) ) + (- \(\dfrac{3}{2}\) )
c) \(\dfrac{4}{5}\)- ( \(\dfrac{-2}{7}\) ) - ( \(\dfrac{7}{10}\) ) d ) \(\dfrac{2}{3}\) - [(-\(\dfrac{4}{7}\) ) - ( \(\dfrac{1}{2}\) + \(\dfrac{3}{8}\) )]
bài 2 : tìm x , biêt
a) x + \(\dfrac{1}{3}\) = \(\dfrac{3}{4}\) ; b) x- \(\dfrac{2}{5}\) = \(\dfrac{5}{7}\)
c) -x - \(\dfrac{2}{3}\) = - \(\dfrac{6}{7}\) d) \(\dfrac{4}{7}\) -x = \(\dfrac{1}{3}\)
( mai nộp bài rôi ai giúp vs )
điền số thích hợp vào ô trống
\(\dfrac{1}{3}+\left(\dfrac{3}{4}-1\dfrac{2}{5}\right)< \overline{ }< 2\dfrac{1}{7}+\left(\dfrac{-2}{5}-\dfrac{1}{4}\right)\)
\(\dfrac{7}{3}+\left(\dfrac{3}{4}-\dfrac{1}{5}\right)>\overline{ }>\dfrac{2}{3}+\left(\dfrac{-1}{4}+\dfrac{2}{7}\right)\)
a)dfrac{-12}{15}+dfrac{-4}{26} b)5dfrac{1}{3}-2dfrac{4}{5}c)dfrac{4}{5}-left(-dfrac{2}{7}right)+-dfrac{5}{10} d)-1dfrac{2}{7}+dfrac{3}{14}-dfrac{5}{21} e)12-dfrac{11}{121}+left(-dfrac{8}{9}right)-left(-dfrac{3}{7}right) f) dfrac{11}{12}-left(1dfrac{3}{4}right)-dfrac{2}{16}
Đọc tiếp
a)\(\dfrac{-12}{15}+\dfrac{-4}{26}\) b)\(5\dfrac{1}{3}-2\dfrac{4}{5}\)
c)\(\dfrac{4}{5}-\left(-\dfrac{2}{7}\right)+-\dfrac{5}{10}\) d)\(-1\dfrac{2}{7}+\dfrac{3}{14}-\dfrac{5}{21}\)
e)\(12-\dfrac{11}{121}+\left(-\dfrac{8}{9}\right)-\left(-\dfrac{3}{7}\right)\) f) \(\dfrac{11}{12}-\left(1\dfrac{3}{4}\right)-\dfrac{2}{16}\)
12 tháng 9 2021 lúc 14:28
1. Tính
\(\left(8\dfrac{9}{4}+\dfrac{2}{7}\right)-\left(-6-\dfrac{3}{7}+\dfrac{5}{4}\right)-\left(3+\dfrac{2}{4}-\dfrac{9}{7}\right)\)