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X x 4 + X x 6=180
X x (4 +6 ) = 180
X x 10 = 180
X = 180:10
X = 18
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a 180 -(x + 15) : 4 =80:5 180 - (x + 15) : 4 = 16 180 - ( x + 15) = 16 x 4 180 - ( x + 15 ) = 64 x + 15 = 180 - 64 x + 15 = 116 x= 116 - 15 x = 101
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( x+16) : x * 12 = 240 - 180 = 60
( x+16) : x = 60 : 12 = 5
x + 16 = 5 * x = (1 + 4) * x = x + (4 * x)
16 = 4 * x
x = 16 : 4 = 4
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Ta có : 93879 : x = 180 dư 459
hay 93879 = 180 x x + 459
=>180 x x = 93879 -459=93420
=> x = 938420 : 180 = 519
Vậy x = 519
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X + 5/9 = 4/3
X = 4/3 - 5/9
X = 7/9
X - 4/9 = 1/2
X = 1/2 + 4/9
X = 17/18
6/13 + X = 7/6
X = 7/6 - 6/13
X = 55/78
13/5 - X = 5/6
X = 13/5 - 5/6
X= 53/30
X + 5/9 = 4/3
x = 4/3 - 5/9
x = 7/9
X - 4/9 = 1/2
x = 1/2 + 4/9
x = 17/18
6/13 + X = 7/6
x = 7/6 - 6/13
x - 55/78
13/5 - X = 5/6
x = 13/5 - 5/6
x = 53/30
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\(a,1337+13\times x=6745\\ \Rightarrow13\times x=6745-1337\\ \Rightarrow x=5408:13\\ \Rightarrow x=416\\ b,142\times x-41\times x-x=408000\\ \Rightarrow x\times\left(142-41-1\right)=408000\\ \Rightarrow x\times100=408000\\ \Rightarrow x=408000:100\\ \Rightarrow x=4080\)
a. 1337 + 13 x x = 6745
13 x x = 6745-1337
13 x x = 5408
x = 5408 : 13
x = 416
b. 142 x x – 41 x x – x = 408000
142 x x – 41 x x – x x 1 = 408000
(142-41-1) x x = 408 000
100 x x = 408000
x = 408 000:100
x = 4080
x*13=x+180
=>13x-x=180
=>12x=180
=>x=180:12
=>x=15
X x 13 = X + 180
X x 13 - 180 = X
X x 13 - X = 180
X x 12 = 180
X = 180 : 12
X = 15