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a) \(\left(3x-3^4\right).7^5=3.7^7\)
\(3x-3^4=3.\left(7^7:7^5\right)\)
\(3x-3^4=3.7^2\)
\(3x-3^4=3.49\)
\(3x-81=147\)
\(3x=147+81\)
\(3x=228\)
\(x=228:3\)
\(x=76\)
b) \(4^{2x-5}-3.4^2=4^2\)
\(4^{2x-5}-3.16=16\)
\(4^{2x-5}-48=16\)
\(4^{2x-5}=16+48\)
\(4^{2x-5}=64\)
\(4^{2x-5}=4^3\)
\(2x-5=3\)
\(2x=3+5\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
\(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}-2.25=25.3\)
\(5^{2x-3}-50=75\)
\(5^{2x-3}=75+50\)
\(5^{2x-3}=125\)
\(5^{2x-3}=5^3\)
\(2x-3=3\)
\(2x=3+3\)
\(2x=6\)
\(x=6:2\)
\(x=3\)
a,(3x-3^4).7^5=3.7^7 b,4^2x-3 -3.4^2=4^2 c,5^2x-3 -2.5^2=5^2.3
3x-3^4=(3.7^7):7^5 4^2x-3 -3.16=16 5^2x-3-2.25=25.3
3x-81=3.7^2 4^2x-3-48=16 5^2x-3-50=75
3x-81=3.49 4^2x-3=16+48 5^2x-3=75+50
3x-81=147 4^2x-3=64 5^2x-3=125
3x=147+81 4^2x-3=4^3 5^2x-3=5^3
3x=228 2x-3=3 2x-3=3
x=228:3 2x=3+3 2x=3+3
x=76 2x=6 2x=6
Vậy=76 x=6:2 x=6:2
x=3 x=3
Vậy x=3 Vậy x=3
a) 123 - 5 (x + 4) = 38
5 (x + 4) = 123 - 38
5 (x + 4) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 - 4
x = 13
b) (3x - 24) . 73 = 2 . 74
3x - 24 = 2 . 74 : 73
3x - 24 = 2 . 7
3x - 16 = 14
3x = 14 + 16
3x = 30
x = 30 : 3
x = 10
c) (x : 3 - 4) . 5 = 15
x : 3 - 4 = 15 : 5
x : 3 - 4 = 3
x : 3 = 3 + 4
x : 3 = 7
x = 7 . 3
x = 21
a, 123 - 5 ( x + 4 ) = 38
=> 5(x+4)=123-38
=> 5(x+4)=85
=> x+4=85:5
=>x+4=17
=>x=17-4
=>x=13
b, ( 3x - 24 ) . 73 = 2 . 74
=> (3x-16).343=4802
=> 3x-16=4802:343
=>3x-16=14
=>3x=14+16
=>3x=30
=>x=30:3
=>x=10
c, 5x+3 - 13 = 112
=> 5x+3=112+13
=>5x+3=125
=> 5x+3=53
=> x+3=3
=>x=3-3
=>x=0
123 - 5(x + 4) = 38
=> 5(x + 4) = 85
=> x + 4 = 17
=> x = 13
vậy_
(3x - 24).73 = 2.74
=> 3x - 16 = 2.74 : 73
=> 3x - 16 = 2.7
=> 3x - 16 = 14
=> 3x = 30
=> x = 10
vậy_
a) 100-(x+21) = 25 b) 55-3x = 59 : 57 c) 43 - 2.(x-21) = 62
x+21 = 100-25 55-3x = 52 64 - 2.(x-21) = 36
x+21 = 75 55-3x = 25 2.(x-21) = 64-36
x = 75-21 3x = 55-25 2.(x-21) = 28
x = 54 3x = 30 x-21 = 28 : 2
x = 30 : 3 x-21 = 14
x = 10 x = 14+21
x = 35
Câu d chưa nghĩ ra,hì hì!
a) 100-(X+21)=25
x+21=25+100
x+21=125
x=125-21
x=104
b) 55-3x=5^9:5^7
55-3x=5^2
55-3x=25
3x=55-25
3x=30
x=30:3
x=10
c) 4^3-2.(x-21)=6^2
4^3-2.(x-21)=36
64-2.(x-21)=36
2.(x-21)=64-36
2.(x-21)=28
x-21=28:2
x-21=14
x=14+21
x=35
Xin lỗi bn mk chỉ giải đc vậy thôi xin thông cảm nha
A )123 -5 ( x -4 ) = 38
=> x-4 = (123-38) :(-5)
=> x-4=-17
=> x= -17+4=-13
B ) ( 3x - 24 ) 73 = 2.74
=> 3x-16= 2.74 :73=14
=> 3x=14+16=30
=> x=30:3=10
C ) ( 2600 + 6400 ) - 3x = 1200
=> 9000-3x=1200
=> 3x=9000-1200=7800
=> x=7800:3=2600
D ) [( 6x - 72 ) : 2 - 84 ] 28 = 5628
=> (6x-72) :2-84= 5628:28=201
=> 6x-72 = (201+84) .2=570
=> 6x=570 +72=642
=> x= 642:6=107
( L-IKE )
A) 123 - 5(x-4) = 38
5(x-4) = 123 - 38
x-4 = 85 : 5
x = 17 + 4
x= 21
B) (3x - 24)73 = 2.74
(3x - 24) = 2.74:73
3x = 14 + 24
x = 30 : 3 = 10
C) (2600 + 6400) - 3x = 1200
9000 - 3x = 1200
3x = 9000 - 1200
x = 7800 : 3 = 2600
D) [(6x - 72) : 2 - 84].28 = 5628
(6x - 72) : 2 - 84 = 5628 : 28 = 201
(6x - 72) : 2 = 201 + 84 = 285
6x - 72 = 285 . 2 = 570
6x = 570 + 72 = 642
x = 642 : 6 = 107
Có thể thử lại đáp án
1. tìm x
kết quả x là : 2010
2. tìm x
a) x = 13
b) x = 6
đúng ko
câu 3 số lớn quá
1.
1(1+2+3+4+....+x)=2021055
1+2+3+4+....+x=2021055:1=2021055
x+(x+1)/1=2021055
=>x(x+1)=1*2021055=2021055=2011*2010 =>x=2010
123-3.(3x-5) = 3.42
<=>123 -9x+15 = 3.16
<=>138-9x = 48
<=>9x = 90
<=>x = 10
Vậy x = 10
x=10 nha