-3/31-6/17- (-1/25) + (-28/31)+(-11/17)-1/5
-3/31+-6/17+1/25+-28/31+-11/31+-11/17+-1/5
\(\dfrac{-3}{31}\) +\(\dfrac{-6}{17}\)+\(\dfrac{1}{25}\)+\(\dfrac{-28}{31}\)+\(\dfrac{-11}{17}\)+\(\dfrac{-1}{5}\)
\(=\left[\left(-\dfrac{3}{31}\right)+\left(-\dfrac{28}{31}\right)\right]+\left[\left(-\dfrac{6}{17}\right)+\left(-\dfrac{11}{17}\right)\right]+\left[\dfrac{1}{25}+\left(-\dfrac{1}{5}\right)\right]\)
\(=\left(-1\right)+\left(-1\right)+\left[\dfrac{1}{25}+\left(-\dfrac{5}{25}\right)\right]\)
\(=\left(-1\right)+\left(-1\right)+\left(-\dfrac{4}{25}\right)\)
\(=\left(-2\right)+\left(-\dfrac{4}{25}\right)\)
\(=\left(-\dfrac{50}{25}\right)+\left(-\dfrac{4}{25}\right)\)
\(=-\dfrac{54}{25}\)
\(=\left(\dfrac{-3}{31}+\dfrac{-28}{31}\right)+\left(\dfrac{-6}{17}+\dfrac{-11}{17}\right)+\left(\dfrac{1}{25}+\dfrac{1}{5}\right)\)
\(=-1+-1+\left(\dfrac{1}{25}+\dfrac{-5}{25}\right)\)
\(=-2\)\(+\dfrac{-4}{25}\)
\(=\)\(\dfrac{50}{25}+\dfrac{-4}{25}\)
=\(\dfrac{46}{25}\)
a) \(\dfrac{-3}{17}\left(\dfrac{2}{3}+\dfrac{3}{17}\right)\)
b) \(D=\dfrac{-3}{31}+\dfrac{-6}{17}+\dfrac{1}{25}+\dfrac{-28}{31}+\dfrac{-11}{17}+\dfrac{-1}{5}\)
b: D=(-3/31-28/31)+(-6/17-11/17)+(1/25-5/25)
=-2-4/25=-54/25
B= - 3/31 + -6/17 + 1/25 + -28/31 + -11/17 + -1/5
chi tiết giúp nhaaaaaaaa
Tinh bang cach hop li
\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\)\(\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)
âm 2( số -2) và 4/25
\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)
\(=\left(\frac{-3}{31}+\frac{-28}{31}\right)+\left(\frac{-6}{17}+\frac{-11}{17}\right)+\left(\frac{1}{25}+\frac{-1}{5}\right)\)
\(=\frac{-31}{31}+\frac{-17}{17}+\frac{-4}{25}\)
\(=\left(-1\right)+\left(-1\right)+\frac{-4}{25}\)
\(=\frac{\left(-25\right)+\left(-25\right)+\left(-4\right)}{25}\)
\(=\frac{-54}{25}\)
(-3/31+-28/31)+(6/17+11/17)+1/25+-1/5
-1+-1+1/25 +-1/5
-2+1/25+-1/5
-2/1+1/25+-1/5
-50/25+1/25+-5/25
-49/25+-5/25
-54/25
mik đúng mn k cho mik nha cảm ơn mn
1) Tính nhanh
A= 4/7 + 3/4 + 2/7 + 5/4 + 1/7
B= -3/31 + -6/17 + 1/25 + -28/31 + -11/7 + -1/5
Mik cần nhanh, mai mik hok r T^T
1) Tính nhanh
\(A=\frac{4}{7}+\frac{3}{4}+\frac{2}{7}+\frac{5}{4}+\frac{1}{7}\)
\(=\left(\frac{4}{7}+\frac{2}{7}+\frac{1}{7}\right)+\left(\frac{3}{4}+\frac{5}{4}\right)\)
\(=1+2=3\)
Ghép tương tự vs B
A = \(\frac{4}{7}+\frac{3}{4}+\frac{2}{7}+\frac{5}{4}+\frac{1}{7}\)
= \(\left(\frac{2}{7}+\frac{4}{7}+\frac{1}{7}\right)+\left(\frac{3}{4}+\frac{5}{4}\right)\)
= \(1+2\)
= \(3\)
Tinh bang cach hop ly
\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\) \(\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)
(-(3)/(31))+ (-(6)/(17)) +( 1)/(2) + (-(28)/(31)) + (-(11)/(17)) + (-(1)/(6))
A = - \(\dfrac{3}{31}\) - \(\dfrac{6}{17}\) + \(\dfrac{1}{2}\) - \(\dfrac{28}{31}\) - \(\dfrac{11}{17}\)- \(\dfrac{1}{6}\)
A = -( \(\dfrac{3}{31}\) + \(\dfrac{28}{31}\)) - ( \(\dfrac{6}{17}\) + \(\dfrac{11}{17}\)) +( \(\dfrac{1}{2}\)- \(\dfrac{1}{6}\))
A = - \(\dfrac{31}{31}\) - \(\dfrac{17}{17}\)+ \(\dfrac{1}{3}\)
A = -1 - 1 + \(\dfrac{1}{3}\)
A = \(-\dfrac{5}{3}\)
Dùng tính chất để tính
a) 17/5 . -31/125 . 1/2 . 10/17 . -1/23
b) (11/4 . -5/9 - 4/9 . 11/4) . 8/33
c) (17/28 + 18/29 - 19/30 - 20/31) . (-5/12 + 1/4 + 1/6)
d) -1/4 . 15^2/11 + 68/4 . -1/11
e) -9/25 . 53/3 - (-3/5)^2 .22/3