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87 _(321_x ) ÷ 5 = 75
(321 _ x ) ÷ 5 = 87_75
(321 _ x ) ÷5 = 12
(321 _ x) = 12 ×5
321 _ x = 60
X = 321_60
X = 261
2)( 5x _24) × 73 = 2 × 74
(5x _ 24 ) = 2×74÷73
( 5x _ 16) = 2×7
5x _ 16 = 14
5x = 14+ 16
5x = 30
X = 30÷5
X = 6
3)93 + 3×(x_5) = 3×52
93+ 3× ( x _ 5) = 75
3×( x _ 5) = 75_93
3×(x _ 5 ) = _18
(X _ 5) = _18 ÷ 3
X _ 5 = _6
X = _6 + 5
X = _1
Tớ chưa kịp làm tối về giải sau
a) 125-(199-x )=72
125 - ( 199-x) = 49
199-x = 76
x = 123
b) 12.(x-3):3=42-23
12(x-3) :3 = 16 - 8
12(x-3) : 3 = 8
12(x-3) = 24
x-3 = 2
x = 5
c) 6+3x+2=87
3x+2 = 81
3x+2 = 34
x + 2 = 4
x= 2
a) 199-x=76
x=123
b) 12.(x-3):3=8
12.(x-3)=24
x-3 =2
x =5
c) 3x.32 = 81
3x=9
=> x =2
\(2^{x+1}.3^y=12^x\)
\(\Rightarrow2^{x+1}.3^y=3^x.4^x\)
\(\Rightarrow2^{x+1}.3^y=3^x.2^{2x}\)
\(\Rightarrow\orbr{\begin{cases}2^{x+1}=2^{2x}\\3^y=3^x\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x+1=2x\\y=x\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=1\\\text{Vì y = x}\Rightarrow y=1\end{cases}}\)
(x - 1)3 = 125
=> (x - 1)3 = 53
=> x - 1 = 5
=> x = 5 + 1
=> x = 6
(2x + 1)3 = 343
=> (2x + 1)3 = 73
=> 2x + 1 = 7
=> 2x = 7 - 1
=> 2x = 6
=> x = 3
720 : [41 - (2x - 5)] = 23.5
=> 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 = 14
a. 5(x-7)-4(x+5)=3.5-12
5x - 5.7 -4x - 4.5 = 15 -12
x(5-4) -35-20 = 3
x -55 = 3
x = 3+55
x = 58
vậy x = 58
b. (2x -15)5= (2x -15)3
vì (2x -15)5= (2x -15)3
=> (2x -15)5 = 1 hoặc (2x -15)5 = 0
=> (2x -15)5 = 15 hoặc (2x -15)5 = 05
=> 2x-15 =1 hoặc 2x-15 = 0
=> 2x = 1+15 hoặc 2x = 0+15
=> 2x =16 hoặc 2x = 15
=> x = 16:2 hoặc x = 15:2
=> x= 8 hoặc x = 7,5
Vì x \(\in\)N => x = 8
vậy x = 8
a) 13 - 2 ( x + 1 ) = 7
=> 2(x+1)=13-7
=>2(x+1)=6
=> x+1=3
=> x=2
b) 15x - 13x = 122 + 56 . 6
=> 15x-13x=93864
=> x.(15-13)=93864
=> x.2=93864
=> x=46947
a)13-2(x+1)=7
2(x+1)=6
x+1=3
x=3-1=2
b)15x-13x=122+56.6
15x-13x=122+93750
2x=93894
x=469847
a) 2 . ( 12 + x ) = 125 - 37
2 . ( 12 + x ) = 88
12 + x = 88 : 2
12 + x = 44
x = 44 - 12
x = 32
b) 87 - ( 321 - x ) : 5 = 3 . 52
87 - ( 321 - x ) : 5 = 75
87 - ( 321 - x ) = 75 . 5
87 - ( 321 - x ) = 375
321 - x = 87 - 375
321 - x = -288
x = 321 + ( - 288 )
x = 33
HỌC TỐT !
a) \(2.\left(12+x\right)=125-37\)
\(\Rightarrow2.\left(12+x\right)=88\)
\(\Rightarrow12+x=88:2\)
\(\Rightarrow12+x=44\)
\(\Rightarrow x=44-12\)
\(\Rightarrow x=32\)
Vậy \(x=32\)
b) \(87-\left(321-x\right):5=3.5^2\)
\(\Rightarrow87-\left(321-x\right):5=3.25\)
\(\Rightarrow87-\left(321-x\right):5=75\)
\(\Rightarrow87-\left(321-x\right)=75.5\)
\(\Rightarrow87-\left(321-x\right)=375\)
\(\Rightarrow321-x=87-375\)
\(\Rightarrow321-x=-288\)
\(\Rightarrow x=321-\left(-288\right)\)
\(\Rightarrow x=609\)
Vậy \(x=609\)