Bài 2: Cộng, trừ số hữu tỉ
Các câu hỏi tương tự
GH
12 tháng 9 2021 lúc 14:28
1. Tính
\(\left(8\dfrac{9}{4}+\dfrac{2}{7}\right)-\left(-6-\dfrac{3}{7}+\dfrac{5}{4}\right)-\left(3+\dfrac{2}{4}-\dfrac{9}{7}\right)\)
Tính giá trị biểu thức:
a. dfrac{20^5times5^{10}}{100^5}
b. dfrac{left(0,9right)^5}{left(0,3right)^6}
c. dfrac{6^3+3times6^2+3^3}{-13}
d. dfrac{4^6times9^5+6^9times120}{8^4times3^{12}-6^{11}}
e. left(2^{-1}+3^{-1}right):left(2^{-1}-3^{-1}right)+left(2^{-1}times2^0right)times2^3
f. left(dfrac{-1}{3}right)^{-1}-left(dfrac{-3}{5}right)^6+left(dfrac{1}{2}right)^2:2
Đọc tiếp
Tính giá trị biểu thức:
a. \(\dfrac{20^5\times5^{10}}{100^5}\)
b. \(\dfrac{\left(0,9\right)^5}{\left(0,3\right)^6}\)
c. \(\dfrac{6^3+3\times6^2+3^3}{-13}\)
d. \(\dfrac{4^6\times9^5+6^9\times120}{8^4\times3^{12}-6^{11}}\)
e. \(\left(2^{-1}+3^{-1}\right):\left(2^{-1}-3^{-1}\right)+\left(2^{-1}\times2^0\right)\times2^3\)
f. \(\left(\dfrac{-1}{3}\right)^{-1}-\left(\dfrac{-3}{5}\right)^6+\left(\dfrac{1}{2}\right)^2:2\)
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) \(\dfrac{11}{12}-\left(1\dfrac{3}{4}\right)-\dfrac{2}{16}\)
Tính
\(1-\dfrac{1}{2}+2-\dfrac{2}{3}+3-\dfrac{3}{4}+4-\dfrac{1}{4}-3-\dfrac{1}{3}-2-\dfrac{1}{2}-1\)
VV
6 tháng 7 2021 lúc 14:43
Giúp mình với
Tính nhanh
\(\dfrac{1}{3}\) - \(\dfrac{3}{4}\) - \(\left(\dfrac{-3}{5}\right)\) + \(\dfrac{1}{64}\) - \(\dfrac{2}{9}\) -\(\dfrac{1}{36}\) + \(\dfrac{1}{15}\)
điền số thích hợp vào ô trống
\(\dfrac{1}{3}+\left(\dfrac{3}{4}-1\dfrac{2}{5}\right)< \overline{ }< 2\dfrac{1}{7}+\left(\dfrac{-2}{5}-\dfrac{1}{4}\right)\)
\(\dfrac{7}{3}+\left(\dfrac{3}{4}-\dfrac{1}{5}\right)>\overline{ }>\dfrac{2}{3}+\left(\dfrac{-1}{4}+\dfrac{2}{7}\right)\)
Tính
a) dfrac{3}{7}+left(-dfrac{5}{2}right)+left(-dfrac{3}{5}right) ; b) left(-dfrac{4}{3}right)+left(-dfrac{2}{5}right)+left(-dfrac{3}{2}right);
c) dfrac{4}{5}-left(-dfrac{2}{7}right)-dfrac{7}{10} ; d) dfrac{2}{3}-left[left(dfrac{-7}{4}right)-left(dfrac{1}{2}+dfrac{3}{8}right)right].
Đọc tiếp
Tính
a) \(\dfrac{3}{7}+\left(-\dfrac{5}{2}\right)+\left(-\dfrac{3}{5}\right)\) ; b) \(\left(-\dfrac{4}{3}\right)+\left(-\dfrac{2}{5}\right)+\left(-\dfrac{3}{2}\right)\);
c) \(\dfrac{4}{5}-\left(-\dfrac{2}{7}\right)-\dfrac{7}{10}\) ; d) \(\dfrac{2}{3}-\left[\left(\dfrac{-7}{4}\right)-\left(\dfrac{1}{2}+\dfrac{3}{8}\right)\right]\).
Tinh:
a) dfrac{7}{8}.left(dfrac{2}{12}+dfrac{4}{10}right)
b) dfrac{3}{2}-dfrac{5}{6}:left(dfrac{1}{2}right)^2+sqrt{4}
c) dfrac{15}{34}+dfrac{7}{21}+dfrac{19}{34}-1dfrac{15}{17}+dfrac{2}{3}
d) left(-2right)^3.left(dfrac{3}{4}-0,25right):left(2dfrac{1}{4}-1dfrac{1}{6}right)
e) 16dfrac{2}{7}:left(-dfrac{3}{5}right)+28dfrac{2}{7}:left(-dfrac{3}{5}right)
GIUP MK T ^ T
Đọc tiếp
Tinh:
a) \(\dfrac{7}{8}.\left(\dfrac{2}{12}+\dfrac{4}{10}\right)\)
b) \(\dfrac{3}{2}-\dfrac{5}{6}:\left(\dfrac{1}{2}\right)^2+\sqrt{4}\)
c) \(\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{19}{34}-1\dfrac{15}{17}+\dfrac{2}{3}\)
d) \(\left(-2\right)^3.\left(\dfrac{3}{4}-0,25\right):\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)
e) \(16\dfrac{2}{7}:\left(-\dfrac{3}{5}\right)+28\dfrac{2}{7}:\left(-\dfrac{3}{5}\right)\)
GIUP MK T ^ T
HA
19 tháng 9 2017 lúc 12:09
tim x
\(\dfrac{5}{6}x-\dfrac{3}{4}=\dfrac{-1}{4}+\dfrac{2}{3}\)
\(-1\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{5}{6}-\left(\dfrac{-2}{5}\right)\)
\(\left(\dfrac{4}{5}:x+1,5\right):\dfrac{2}{3}=-1,5\)
\(\dfrac{4}{3}x-\dfrac{2}{3}=\dfrac{1}{4}-x\)
giup minh nhe minh dang can gap