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14:(0,4+0,16:x)=7
=> (0,4+0,16:x)=14:7
=>(0,4+0,16:x)=2
=>0,16:x=2-0,4
=> 0,16:x =1,6
=>x= 0,16:1,6
=>x=0,1
14: ( 0,4+0,16 : x ) =7
0,4 + 0,16 : x = 14 : 7 = 2
0,16 : x = 2 - 0,4 = 1,6
x = 0,16 : 1,6 = 0,1
Vậy x = 0,1
14: ( 0,4+0,16 : x ) =7
=>\(0,4+0,16:x\)= 14:7
=>\(\left(0,4+0,16:x\right)=2\)
=>\(0,16:x=2-0,4\)
=>\(0,16:x=1,6\)
=> x=0,1
a)13-2(x+1)=7
2.(x+1)=13-7
2.(x+1)=6
x+1=6/2
x+1=3
x=3-1
x=2
a, 13 - 2 ( x + 1 ) = 7
2 .( x + 1 ) = 13 - 7
2 .( x + 1 ) = 6
x + 1 = 6 : 2
x + 1 = 3
x = 3 - 1
x = 4
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
a) \(70-\left(x-3\right)=45\)
\(x-3=70-45\)
\(x-3=25\)
\(x=25+3\)
\(x=28\)
b) \(12+\left(5+x\right)=20\)
\(5+x=20-12\)
\(5+x=8\)
\(x=8-5\)
\(x=3\)
c) \(130-\left(100+x\right)=25\)
\(100+x=130-25\)
\(100+x=105\)
\(x=105-100\)
\(x=5\)
d) \(175+\left(30-x\right)=200\)
\(30-x=200-175\)
\(30-x=25\)
\(x=30-25\)
\(x=5\)
e) \(\left(x+12\right)+22=92\)
\(x+12=92-22\)
\(x+12=70\)
\(x=70-12\)
\(x=58\)
f) \(95-\left(x+2\right)=45\)
\(x+2=95-45\)
\(x+2=50\)
\(x=50-2\)
\(x=48\)
a)
70 - (x - 3) = 45
x - 3 = 70 - 45 = 25
x = 25 + 3 = 28
Vậy x = 28
b)
12 + (5 + x) = 20
5 + x = 20 - 12 = 8
x = 8 - 5 = 3
Vậy x = 3
c)
130 - (100 + x) = 25
100 + x = 130 - 25 = 115
x = 115 - 100 = 15
Vậy x = 15
d)
175 + (30 - x) = 200
30 - x = 200 - 175 = 25
x = 30 - 25 = 5
Vậy x = 5
e)
(x + 12) + 22 = 92
x + 12 = 92 - 22 = 70
x = 70 - 12 = 58
Vậy x = 58
f)
95 - (x + 2) = 45
x + 2 = 95 - 45 = 50
x = 50 - 2 = 48
Vậy x = 48
420 + 65x4 = ( x + 175) : 5 + 30
420 + 260 = x : 5 + 175 : 5 + 30
680 = x : 5 + 35 + 30
680 - 30 = x : 5 + 35
650 = x : 5 + 35
650 - 35 = x : 5
615 = x : 5
615 x 5 = x
3075 = x
b) ( 32 x 15) : 2 = ( x + 70):14 - 40
480 : 2 = x : 14 + 70 : 14 - 40
240 = x : 14 + 5 - 40
240 + 40 = x : 14 + 5
280 = x: 14 + 5
280 - 5 = x : 14
275 = x : 14
275 x 14 = x
3850 = x
c) x - 4867 = ( 175 x 2050 x 70) : 25 + 23
x - 4867 = 25 112 500 : 25 + 23
x - 4867 = 1004500 + 23
x - 4867 = 1004523
x = 1004523 + 4867
x = 1008390
a, \(420+65:4=\left(x+175\right):5+30\)
\(\Rightarrow\left(x+175\right):5+30=420+16,25\)
\(\Rightarrow\left(x+175\right):5=420+16,25-30=406,25\)
\(\Rightarrow x+175=2031,25\)
\(\Rightarrow x=1856,25\)
b, \(\left(32.15\right):2=\left(x+70\right):14-40\)
\(\Rightarrow\left(x+70\right):14-40=480:2\)
\(\Rightarrow\left(x+70\right):14=240+40=280\)
\(\Rightarrow x+70=3920\Rightarrow x=3850\)
c, \(x-4867=\left(175.2050.70\right):25+23\)
\(\Rightarrow x=39462500:25+23+4867\)
\(\Rightarrow x=1578500+23+4867=1583390\)
Chúc bạn học tốt!!!
