2x 17 + 38 x17 + 31 x 17 + 29 x 17
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\(\dfrac{37}{17}+\dfrac{31}{17}< x\le\dfrac{50}{18}.\dfrac{38}{25}\)
\(4< x\le4\dfrac{2}{9}\)
⇒x=∅
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
PT \(\Leftrightarrow x-29-17+38=-9\)
\(\Leftrightarrow x=-9-38+17+29=-1\)
Vậy ...
( x - 29 ) - ( 17 - 38 ) = - 9
x-29-17+38=-9
x=-9+29+17-38
x=-1
e: =>-40+3+33+40-x=47
=>36-x=47
=>x=-11
f: =>x(x-3)(11-x)(11+x)=0
hay \(x\in\left\{0;3;11;-11\right\}\)
g: =>-62-38-x+2x=-100
=>x-100=-100
hay x=0
i: =>x-12-2x-31=6
=>-x-43=6
=>x+43=-6
hay x=-49
h: =>(x+1)=0
=>x=-1
f: =>x(x-3)(x+11)(x-11)=0
hay \(x\in\left\{0;3;-11;11\right\}\)
9. Tìm x biết
a x- ( 12- 15)= -8
<=> x - 12 + 15 = -8
<=> x + 3 = -8
<=> x = -11
Vậy x = -11
b. (x- 29 )- ( 17- 38)= -9
<=> x - 29 - 17 + 38 = -9
<=> x - 8 = -9
<=> x = -1
Vậy x = -1
a) x-12+15=-8
=>x=-8-15+12
=>x=-11
Vậy x=-11
b)x-29+21=-9
=>x=-9-21+29
=>x=-1
Vậy x=-1
\((x-29)-(17-38)=-9\\ \Leftrightarrow x - 29 - (-21) = -9\\ \Leftrightarrow x - 8 = - 9\\ \Leftrightarrow x = - 1\)
2 x 17 + 38 x 17 + 31 x 17 + 29 x 17
= 17 x ( 2 + 38 + 31 + 29 )
= 17 x 100
= 1700
2x17+38x17+31x17+29x17
=17x(2+38+31+29)
+17x100
=1700