A = \(\dfrac{18}{26}\) + (-\(\dfrac{5}{27}\)) + (-\(\dfrac{22}{86}\)) + \(\dfrac{12}{39}\) - \(\dfrac{32}{43}\)

A = \(\dfrac{9}{13}\) - \(\dfrac{5}{27}\) -  \(\dfrac{11}{43}\) + \(\dfrac{4}{13}\) - \(\dfrac{32}{43}\)

A = (\(\dfrac{9}{13}\) + \(\dfrac{4}{13}\)) - (\(\dfrac{11}{43}\) + \(\dfrac{32}{43}\)) - \(\dfrac{5}{27}\)

A = \(\dfrac{13}{13}\) - \(\dfrac{43}{43}\) - \(\dfrac{5}{27}\)

A = 1 - 1 - \(\dfrac{5}{27}\)

A = 0 - \(\dfrac{5}{27}\)

A = - \(\dfrac{5}{27}\)

hãy quy đồng các phân số sau

A = 18/26 + -5/27 + -22/86 + 12/39 + -32/43 

A = 9/13 + -5/27 + -11/43 + 4/13 + -32/43

A = -5/27 + ( 9/13 + 4/13 ) + ( -11/43 + -32/43 )

A = -5/27 + 1 + ( -1)

A = -5/27 + 0 

A = 0

B = -10/12 + 8/15 + -19/56 + 3/-18 + 28/60

B = -5/6 + 8/15 + -19/56 + -1/6 + 7/15

B = -19/56 + ( -5/6 + -1/6 ) + ( 8/15 + 7/15 ) 

B = -19/56 + ( -1 ) + 1

B = -19/56 + 0

B = 0

tinh nhanh

70+50+30+50+26+97+3+74

=(70+30)+(50+50)+(97+3)+(74+26)

=100+100+100+100

=400

209-134

56+78=134

78+97=175

145-74=71

12+56-34+89=68-34+89=34+89=123

70+50+30+50+26+97+3+74=(70+30)+(50+50)+(26+74)+(97+3)=100+100+100+100=400

209-134=75

210-73=137

(-26) + 148 + (-74) + (-86) + (-48) = -86

gthik vs ạ

Ta có: \(16\times48+8\times48+32\times14\)

\(=48\times\left(16+8\right)+32\times14\)

\(=48\times24+32\times14=16\times3\times4\times6+32\times2\times7\)

\(=64\times18+64\times7=64\times\left(18+7\right)=64\times25=1600\)

Ta có: 325+426-418-317

=(325-317)+(426-418)

=8+8

=16

Ta có: \(\frac{16\times48+8\times48+32\times14}{325+426-418-317}\)

\(=\frac{1600}{16}=100\)