Sửa đề:
\(A=\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{9}{34}-1\dfrac{15}{17}+\dfrac{2}{3}\)
\(=\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{9}{34}-\dfrac{32}{17}+\dfrac{2}{3}\)
\(=-\dfrac{3}{17}\)
tính: A = \(\dfrac{15}{34}+\dfrac{27}{21}+\dfrac{9}{34}-1\dfrac{15}{17}+\dfrac{2}{3}\)
B = \(16\dfrac{2}{7}:\left(-\dfrac{3}{5}\right)-28\dfrac{2}{7}:\left(-\dfrac{3}{5}\right)\)
I. thực hiện phép tính
a. \(\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{19}{34}-\dfrac{20}{15}+\dfrac{3}{7}\)
b. \(\dfrac{27}{25}+\dfrac{4}{21}-\dfrac{2}{25}+\dfrac{17}{21}-\dfrac{1}{2}\)
Bài 1:Tính nhanh có thể
15/34+7/21+19/34-3/1+7/21+2
Câu 1: Thực hiện phép tính bằng cách hợp lí:
a)\(\dfrac{15}{34}\)+\(\dfrac{7}{21}\)+\(\dfrac{19}{34}\)-\(2^{15}_{17}\)+\(\dfrac{2}{3}\)
b) -(2,73.4+2,85)+4.2,73-(2-2,85)
Tính
A) \(\frac{15}{34}+\frac{7}{21}+\frac{19}{34}-1\frac{15}{17}+\frac{2}{3}\)
B) \(\left(-2\right)^3\times\left(\frac{3}{4}-0,25\right):\left(2\frac{1}{4}-1\frac{1}{6}\right)\)
Tìm x
A) \(4\frac{1}{3}:\frac{\chi}{4}=6:0,3\)
B) \(\left(2^3:4\right)\times2^{\left(\chi+1\right)}=64\)
Bài 1 B, 4^1/5:(-2^4/5) c, 1,8:(-3/4) d, 17/15:4/3 e, -12/21:34/43
2. thực hiện phép tính
a \(\dfrac{17}{15}:\dfrac{4}{3}\)
b.\(\dfrac{-12}{21}:\dfrac{34}{43}\)
c.\(\dfrac{-5}{9}.\dfrac{3}{11}+\dfrac{13}{18}.\dfrac{3}{11}\)
d.\(\dfrac{-2}{9}.\dfrac{5}{11}+\dfrac{-16}{9}.\dfrac{5}{11}\)
B=((3+0,75)-3/19)/(5/+0,625-5/38) × (15+15/17-15/144+15/34)/(2+3/17-2/144)+2018
Thực hiện phép tính:
\(\frac{3+0,75-\frac{3}{19}}{\frac{5}{2}+0,625-\frac{5}{38}}\cdot\frac{15+\frac{15}{17}-\frac{15}{144}+\frac{15}{34}}{2+\frac{3}{17}-\frac{2}{144}}+2018\)