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15.x+19.x=39440
x.(15+19)=39440
x.34=39440
x=39440:34
x=1160
vậy x=1160
24.x-24.875=13608
24.(x-875)=13608
x-875=13608:24
x-875=576
x=576+875
x=1442
vậy x=1442
15.x+19.x=39440
x.(15+19)=39440
x.34=39440
x=39440:34
x=1160
vậy x=1160
=>24.(x-875)=567.24 =>x.(15+19)=1160.34
=>x-875=567. =>x.34=1160.34
=>x=567+875 =>x=1160
=>x=1442
a: =17/25(13/19+6/19)=17/25
b: \(=\dfrac{47}{19}\cdot\dfrac{32}{15}-\dfrac{47}{19}\cdot\dfrac{17}{15}=\dfrac{47}{19}\)
tính bằng cách thuận tiện nhất
a,4/15 x 7/8 + 4/15 x 2/9
b, 13/29 x 23/11 -13/19 x 8/11 - 13/19 x 4/11
c1:
9360:(26x8)=9360:208=45
(492x25):123=12300:123=100
9072:81+39440:34=1272
c2:
9360:(26x8)=9360:26:8=45
(492x25):123=1492:123x25:123=100
9072:81+39440:34=1272
a: \(=\dfrac{17}{19}\cdot\dfrac{19}{17}\cdot\dfrac{4}{5}=\dfrac{4}{5}\)
b: \(=\dfrac{14}{7}\cdot\dfrac{7}{6}=2\cdot\dfrac{7}{6}=\dfrac{14}{6}=\dfrac{7}{3}\)
c: =13/14(4/5+1/5)=13/14
\(\dfrac{17}{19}\times\dfrac{12}{15}\times\dfrac{19}{17}.\\ =\dfrac{17}{19}\times\dfrac{19}{17}\times\dfrac{12}{15}.\\ =1\times\dfrac{12}{15}=\dfrac{12}{15}.\\ \left(\dfrac{5}{7}+\dfrac{9}{7}\right)\times\dfrac{21}{18}.\\ =2\times\dfrac{7}{6}=\dfrac{7}{3}.\\ \dfrac{4}{5}\times\dfrac{13}{14}+\dfrac{13}{14}\times\dfrac{1}{5}.\\ =\left(\dfrac{4}{5}+\dfrac{1}{5}\right)\times\dfrac{13}{14}.\\ =1\times\dfrac{13}{14}.\\ =\dfrac{13}{14}.\)
15 . x + 19 . x = 39440
34.x = 39440
x = 39440 / 34= 1160
15 . x + 19 . x = 39440
34.x = 39440
x = 39440 / 34= 1160