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( X + 5,42 ) x 17 = 142,29
X + 5,42 = 142,29 : 17
X + 5,42 = 8,37
X = 8,37 - 5,42
X = 2,95
X x 8 + X x 15 = 653,2
X x ( 8 + 15 ) = 653,2
X x 23 = 653,2
X = 653,2 : 23
x = 28,4
( x + 5,42 ) x 17 = 142,29 x . 8 + x . 15 = 653,2
x + 5,42 = 142,29 : 17 x . ( 8 + 15 ) = 653,2
x + 5,42 = 8,37 x . 23 = 653,2
x = 8,37 - 5,42 x = 653,2 : 23
x = 2,95 x = 28,4
x * 8 + x * 15 = 653,2
=> x * ( 8 + 15 ) = 653,2
=> x * 23 = 653,2
=> x = 653,2 / 23
=> x = 28,4
X x 8 + X x 15 = 653,2
=> X x ( 8 + 15 ) = 653,2
=> X x 23 = 653,2
=> x = 28,4
\(x.8+x.15=653,2\)
\(\Rightarrow x\left(8+15\right)=653,2\)
\(\Rightarrow x.23=653,2\)
\(\Rightarrow x=653,2\div23\)
\(\Rightarrow x=28,4\)
( x + 5,42) x 17 = 142,29
( x + 5,42 ) = 142,29 : 17
( x + 5,42) = 8,37
x = 8,37 - 5,42
x = 2,95
( x + 5,42 ) * 17 = 142,29
x + 5,42 = 142,29 : 17
x + 5,42 = 8,37
x = 8,37 - 5,42
x = 2,95
k mình
k lại
a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
\(A=2,53\times17+17,67\times15+2,53\times83+17,67\times85\)
\(A=2,53\times17+2,53\times83+17,67\times15+17,67\times85\)
\(A=2,53\times\left(17+83\right)+17,67\times\left(15+85\right)\)
\(A=2,53\times100+17,67\times100\)
\(A=253+1767\)
\(A=2020\)
a)x+5,42=142,29:17
x+5,42=8,37
x =8,37-5,42
x =2,95