Tìm x:
x*5 + x *4 + x = 350
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b, 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315
23 - 27 = 1 + \(\dfrac{350}{x}\) + 315
316 + \(\dfrac{350}{x}\) = -4
\(\dfrac{350}{x}\) = - 316 - 4
\(\dfrac{350}{x}\) = -320
-320 \(x\) = 350
\(x\) = 350: (-320)
\(x\) = - \(\dfrac{35}{32}\) (loại)
Vậy \(x\) \(\in\) \(\varnothing\)
c, 720 : [ 41 - (2\(x\) - 5)] = 23.5
41 - (2\(x\) - 5) = 720 : (23.5)
41 - 2\(x\) + 5 = 18
46 - 2\(x\) =18
2\(x\) = 46 - 18
2\(x\) = 28
\(x\) = 28: 2
\(x\) = 14
Vậy \(x\) = 14
(x+1)+(x+3)+(x+5)+....+(x+19)=350
x =350-(1+3+5+.................+19)
x =350-100
x =250:10
x =25
a) 150 : [17 - (2x - 3)] = 350
=> 17 - (2x - 3) = \(\frac{150}{350}=\frac{3}{7}\)
=> 2x - 3 = \(17-\frac{3}{7}=\frac{116}{7}\)
=> 2x = \(\frac{116}{7}+3\)
=> 2x = \(\frac{137}{7}\)
=> x = \(\frac{137}{7}:2=\frac{137}{14}\)
b) 4 . [105 - (x - 9)] - 486 = 0
=> 4. [105 - (x - 9)] = 486
=> 105 - (x - 9) = 243/2
=> x - 9 = \(105-\frac{243}{2}=-\frac{33}{2}\)
=> x = \(-\frac{33}{2}+9=-\frac{15}{2}\)
c) 1000 - 2{600 - 4.[198 - 7.(21 - 7)]}.x = 200
=> 1000 - 2{600 - 4.[198 - 7.14]}.x = 200
=> 1000 - 2{600 - 4.[198 - 98].x = 200
=> 1000 - 2{600 - 4.100}.x = 200
=> 1000 - 2{600 -400}.x = 200
=> 1000 - 2.200.x = 200
=> 2.200.x = 800
=> 400.x = 800
=> x = 2
Câu 2 :
a) 350 : [19 - (7x - 3)] = 350
=> 19 - (7x - 3) = 1
=> 7x - 3 = 18
=> 7x = 21
=> x = 3
b) 7.[109 - (x - 9)] - 420 = 0
=> 7.[109 - (x - 9)] = 420
=> 109 - (x - 9) = 60
=> x - 9 = 49
=> x = 49 + 9 = 58
c) 254 - 2{200 - 4.[90 - 7.(19 - 9)]}.x = 54
=> 254 - 2{200 - 4.[90 - 7.10]}.x = 54
=> 254 - 2{200 - 4[90 - 70]} . x= 54
=> 254 - 2{200 - 4.20} . x = 54
=> 254 - 2{200 - 80}.x = 54
=> 254 - 2.120 . x= 54
=> 2.120.x = 200
=> 240.x = 200
=> \(x=\frac{5}{6}\)
a) 350 - 6(x - 2) = 230
6(x - 2) = 350 - 230
6(x - 2) = 120
x - 2 = 120 : 6
x - 2 = 20
x = 20 + 2
x = 22
\(92.4-27=\frac{x+350}{x}+135\)
=>\(368-27=\frac{x}{x}+\frac{350}{x}+315\)
=>\(341=1+\frac{350}{x}+315\)
=>\(341=\frac{350}{x}+316\)
=>\(341-316=\frac{350}{x}\)
=>\(\frac{350}{x}=25\)
=>x=350:25
=>x=14
368-27=(x+350):x+315
341=(x+350):x+315
x:x+350:x=341-315
1+350:x=26
350:x=26-1
350:x=25
x=350:25
x=14
hk tốt
92 . 4 - 27 = (x+ 350 ) : x + 315
<=> 365 - 27 = (x + 350):x +315
<=> 341 = (x+350 : x +315
<=> (x + 350 ): x = 341 - 315
<=> (x + 350 ) : x = 26
<=>(x + 350 ) . 1/x=26
<=> x . 1/x + 350 . 1/x = 26
<=> 1 + 350/x =26
<=> 350/x = 26-1
<=> 350 : x = 25
<=> x = 350 : 25
<=> x = 14
vậy x = 14
\(x\) x ( 5 + 4 +1 ) = 350
\(x\) = 350 : 10
\(x\) =35
x * 5 + x * 4 + x = 350
x * 5 + x * + x * 1 = 350
x * (5 + 4 +1) = 350
x * 10 = 350 : 10
x = 35