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a: =13/26*9/18*2/3=2/3*1/4=2/12=1/6
b: =44/22*5/15*3/2=2*1/3*3/2=2*1/2=1
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{5}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
2,07 + 4,15 + 17,93 + 5,85
= (2,07 + 17,93) + (4,15 + 5,85)
= 20 + 10
= 30
a) \(\frac{13}{18}\times\frac{9}{26}\times\frac{2}{3}=\left(\frac{13}{18}\times\frac{9}{26}\right)\times\frac{2}{3}=\frac{1}{4}\times\frac{2}{3}=\frac{1}{6}\)
b) \(\frac{44}{15}\times\frac{5}{22}\times\frac{3}{2}=\left(\frac{44}{15}\times\frac{5}{22}\right)\times\frac{3}{2}=\frac{2}{3}\times\frac{3}{2}=1\)
Đáp số : a) \(\frac{1}{6}\); b)1
a)13/18 x 9/26 x 2/3
=13/18*3/13*2/3
=(13/18*3/13)*2/3
=1/4*2/3
=1/6
b) 44/15 x 5/22 x 3/2
=(44/15*5/22)*3/2
=2/3*3/2
=1
c) \(\left(11+12+13+...+19\right).\left(6.8-48\right)=\left(11+12+13+...+19\right).\left(48-48\right)\)
\(=\left(11+12+13+...+19\right).0\)
\(=0\)
Hok "tuốt" nha^^
b) \(\left(500.9-250.18\right).\left(1+2+3+...+9\right)=\left(250.2.9-250.18\right).\left(1+2+...+9\right)\)
\(=\left(250.18-250.18\right).\left(1+2+3+...+9\right)\)
\(=0.\left(1+2+3+...+9\right)\)
\(=0\)
Hok tốt nha^^ (lần 2)
a)
0,9 x 438 x 2 + 0,18 x 2520 + 0,6 x 310 x 3
= 0,9 x 2 x 438 + 0,18 x 2520 + 0,6 x 3 x 310
= 0,18 x 438 + 0,18 x 2520 + 0,18 x 310
= 0,18 x .....................
= 0,18 x ...........
= ..................
~ Hok t ~
\(\frac{13}{19}\times\left(\frac{19}{13}-\frac{7}{9}\right)\\ =\frac{13}{19}\times\frac{19}{13}-\frac{13}{19}\times\frac{7}{9}\)
\(=1-\frac{91}{171}\)
\(=\frac{80}{171}\)
Thấy đúng thì k đúng giúp mik
4/15 + 8/13 + 11/15 + 5/13
= ( 4/15 + 11/15 ) + ( 8/13 + 5/13 )
= 15/15 + 13/13
= 1 + 1
=2
\(\dfrac{134}{143}\times\dfrac{13}{15}+\dfrac{13}{15}\)
\(=\dfrac{13}{15}\times\left(\dfrac{134}{143}+1\right)\)
\(=\dfrac{13}{15}\times\dfrac{277}{143}=\dfrac{277}{15\times11}=\dfrac{277}{165}\)
thanh kiu