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720:[41-(2x-5)]=23.5
\(\Rightarrow\)720:[41-(2x-5)]=40
\(\Rightarrow\)46-2x=720:40=18
\(\Rightarrow\)46-2x=18
\(\Rightarrow\)2x=46-18=28
\(\Rightarrow\)x=28/2=14
720 : [ 41 . ( 2x - 5 )] = 23 . 5
=> 720 : [ 41 . ( 2x - 5 )] = 40
=> 41 . ( 2x - 5 ) = 18
=> 2x - 5 = \(\frac{18}{41}\)
=> 2x = \(\frac{223}{41}\)
=> x = \(\frac{223}{82}\)
a)\(280-\left(x-140\right):35=270\)
\(\Leftrightarrow\left(x-140\right):35=10\)
\(\Leftrightarrow x-140=350\)
\(\Leftrightarrow x=490\)
b) \(\left(190-2x\right):35-32=16\)
\(\Leftrightarrow\left(190-2x\right):35=48\)
\(\Leftrightarrow190-2x=1680\)
\(\Leftrightarrow2x=-1490\Leftrightarrow x=-745\)
c) \(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=40\)
\(\Leftrightarrow41-\left(2x-5\right)=18\)
\(\Leftrightarrow2x-5=23\)
\(\Leftrightarrow2x=28\Leftrightarrow x=14\)
280-(x-140):35=270
(x-140):35=280-270
(x-140):35=10
(x-140)=10×35
(x-140)=350
x=350-140
x=210
vậy x=210
(192-2x):35-32=16
(192-2x):35=16+32
(192-2x):35=48
(192-2x)=48×35
(192-2x)=1680
2x=192-1680
2x=-1488
x=-1488:2
x=-744
vậy x=-744
720 : [41-(2x-5)] = 2^3 . 5
720 : [41-(2x-5) ] =40
=> 41-(2x-5) =18
=> 2x-5 =23
=> 2x =28
=> x=14
720: ( 41-(2x-5) ) = 23 . 5
<=> 720 : ( 41 - ( 2x-5 ) ) = 8.5
<=> 720 : ( 41 - (2x -5 ) ) = 40
<=> ( 41 - ( 2x - 5) ) = 720 : 40 = 18
<=> 2x - 5 = 41 -18 = 23
<=> 2x = 23+5 =28
=> x = 28 : 2 =14
\(720:\left[41-\left(2x-5\right)\right]=2^3\times5\)
\(720:\left[41-\left(2x-5\right)\right]=40\)
\(\left[41-\left(2x-5\right)\right]=720:40\)
\(2x=23+5\)
\(x=28:2\)
\(x=14\)
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-\left(2x-5\right)\right]=8.5\)
\(720:\left[41-\left(2x-5\right)\right]=40\)
\(41-\left(2x-5\right)=720:40\)
\(41- \left(2x-5\right)=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(\Rightarrow x=14\)
13) \(720\div\left[41-\left(2x-5\right)\right]=2^3.5\)
\(\Rightarrow720\div\left[41-\left(2x-5\right)\right]=40\)
\(\Rightarrow41-\left(2x-5\right)=720\div40\)
\(\Rightarrow41-\left(2x-5\right)=18\)
\(\Rightarrow2x-5=41-18\)
\(\Rightarrow2x-5=23\)
\(\Rightarrow2x=23+5\)
\(\Rightarrow2x=28\)
\(\Rightarrow x=28\div2\)
\(\Rightarrow x=14\)
14) \(\left\{\left[\left(2x+14\right)\div2^2-3\right]\div2\right\}-1=0\)
\(\left[\left(2x+14\right)\div2^2-3\right]\div2=0+1\)
\(\left[\left(2x+14\right)\div2^2-3\right]\div2=1\)
\(\left(2x+14\right)\div2^2-3=1.2\)
\(\left(2x+14\right)\div2^2-3=2\)
\(\left(2x+14\right)\div2^2=2+3\)
\(\left(2x+14\right)\div2^2=5\)
\(2x+14=5.2^2\)
\(2x+14=20\)
\(2x=20-14\)
\(2x=6\)
\(x=6\div2\)
\(x=3\)
\(720:\left[41-\left(2x-5\right)\right]=120\)
\(\Leftrightarrow41-\left(2x-5\right)=6\)
\(\Leftrightarrow2x-5=35\)
\(\Leftrightarrow2x=40\)
\(\Leftrightarrow x=20\)
hok tốt!
720 : [ 41 - ( 2x - 5 ) ] = 120
41 - ( 2x - 5 ) ] = 720 : 120 = 6
2x - 5 = 41 - 6 = 35
2x = 35 + 5 = 40
x = 40 : 2 = 20
Học tốt
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=40\)
\(\Leftrightarrow41-\left(2x-5\right)=720:40\)
\(\Leftrightarrow41-\left(2x-5\right)=18\)
\(\Leftrightarrow2x-5=41-18\)
\(\Leftrightarrow2x-5=23\)
\(\Leftrightarrow2x=28\)
\(\Leftrightarrow x=14\)
Ta có :\(720:\left[41-\left(2X-5\right)\right]=2^3\cdot5\)
\(\Leftrightarrow41-\left(2X-5\right)=18\)
\(\Leftrightarrow2X-5=23\)
\(\Leftrightarrow2X=28\)
\(\Leftrightarrow X=14\)(TMĐK)
Vậy X= 14 là giá trụ cần tìm.
720 : [41 - (2x - 5)] = 2³.5
720 : [41 - (2x - 5)] = 8.5
720 : [41 - (2x - 5)] = 40
41 - (2x - 5) = 720 : 40
41 - (2x - 5) = 18
2x - 5 = 41 - 18
2x - 5 = 23
2x = 23 + 5
2x = 28
x = 28 : 2
x = 14
\(720:\left[41-\left(2x-5\right)\right]=2^3\cdot5\)
\(\Rightarrow720:\left(41-2x+5\right)=8\cdot5\)
\(\Rightarrow720:\left(46-2x\right)=40\)
\(\Rightarrow46-2x=720:40\)
\(\Rightarrow46-2x=18\)
\(\Rightarrow2x=46-18\)
\(\Rightarrow2x=28\)
\(\Rightarrow x=28:2\)
\(\Rightarrow x=14\)