720 - [41 - (2 * x -5)]=420
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a){720:[41-(7.2\(^2\)- X)] }:(2\(^3\).5)=1
{720:[41-(7.4-X)] }:(8.5)=1
{720:[41-(28-X)] }:40=1
41-(28-X):40=1.720
41-(28-X):40=720
(28-X):40=720+41
(28-X):40=716
28-X =716.40
28-X=28640
X=28-28640
X=(-28612)
b)420+65.4=(x+175):5+30
420+260=(x+175):5+30
280=(x+175):5+30
(x+175):5=280-30
(x+175):5=250
x+175=250.5
x+175=1250
x=1250-175
x=1075
c)(32.15):2=(x+70):14-40
480:2=(x+70):14-40
240=(x+70):14-40
(x+70):14=240+40
(x+70):14=280
x+70=280.14
x+70=3920
x=3920-70
x=3850
\(720:\left[41-\left(2.x:5\right)\right]=120\)
\(\left[41-\left(2.x:5\right)\right]=720:120\)
\(41-\left(2.x:5\right)=6\)
\(2.x:5=41-6\)
\(2.x:5=35\)
\(2.x=35.5\)
\(2.x=175\)
\(x=\dfrac{175}{2}\)
\(a,x-36:18=12-15\\ \Rightarrow x-2=-3\\ \Rightarrow x=-1\\ b,92-\left(17+x\right)=72\\ \Rightarrow17+x=20\\ \Rightarrow x=3\\ c,720:\left[41-\left(2x+5\right)\right]=40\\ \Rightarrow41-\left(2x+5\right)=18\\ \Rightarrow2x+5=23\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ d,\left(x+2\right)^3-23=41\\ \Rightarrow\left(x+2\right)^3=64\\ \Rightarrow\left(x+2\right)^3=4^3\\ \Rightarrow x+2=4\\ \Rightarrow x=2\)
720:[41-2.x-5)]=40
41-2.x-5=720:40
41-2.x-5=18
41-2.x=18+5
41-2.x=23
2.x=41-23
2.x=18
x=18:2
X=9
720 : (41 - 2.x-5) = 23.5
720 : (41 - 2x - 5) = 8. 5
720 : (41 - 2x - 5) = 40
( 41 - 2x - 5) = 720 : 40
41 - 2x - 5 = 18
41 - 2x =18 + 5
41 - 2x = 23
2x = 41 - 23
2x = 18
x = 18 : 2
x = 9
Li-ke mik nhé! Có ji ko hiểu thì cứ hỏi nha
720:[41-(2.X-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:[41-(2.X-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
Ta có :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 = 25
=> 2x = 25 + 5
=> 2x = 30
=> x = 30 : 2
=> x = 15
Vậy x = 15
720:[41-(2x-5)]=8.5
41-(2x-5)=720:40
2x-5=41-18
2x-5=23
2x=28
x=14
Vậy x=14
Mk viết 2.x là 2x nha bạn, k cho mk nha
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
2.x=23+5
2.x=28
x=28:2
x=14
\(720-\left[41-\left(2\times x-5\right)\right]=420\)
\(\Rightarrow41-\left(2\times x-5\right)=720-420\)
\(\Rightarrow41-\left(2\times x-5\right)=300\)
\(\Rightarrow2\times x-5=41-300\)
\(\Rightarrow2\times x-5=-259\)
\(\Rightarrow2\times x=-259+5\)
\(\Rightarrow2\times x=-254\)
\(\Rightarrow x=-254:2\)
\(\Rightarrow x=-127\)
Vậy \(x=-127\)
Học tốt # ^-<
720−[41−(2×x−5)]=420
⇒41−(2×x−5)=720−420
⇒41−(2×x−5)=300
⇒2×x−5=41−300
⇒2×x−5=−259
⇒2×x=−259+5
⇒2×x=−254
⇒x=−254:2
⇒x=−127
Vậy x=−127