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x23:216=x15.x5
x23: 63= x20
==> 63=x23:x20
==> 63=x3
==> x=6
(5x.5x+2):53=125
==> 52x+2:53=53
==> 52x+2=53.53
==> 52x+2=56
==> 2x+2=6
2x=6–2
2x=4
x=4:2
x=2
(3x.3x+4):33=243
==> 32x+4:33=35
32x+4=35.33
32x+4=38
==> 2x+4=8
2x=8–4
2x=4
x=4:2
x=2
3x+3x+1+3x+2=243
3x.1+3x.31+3x.32=243
3x.(1+31+32)=243
3x. (1+3+9)=243
3x.13=243
3x=243:13
3x=...
a) (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.
b) 128 - 3 . (x + 4) = 23
3 . (x + 4) = 128 - 23
3 . (x + 4) = 105
x + 4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31.
c) (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.
d) 5x + x = 39 - 311 : 39
5x + x = 39 - 32
5x + x = 39 - 9
6x = 30
x = 30 : 6
x = 5.
a) \(\left(\dfrac{x}{3}-4\right).5=15\)
\(\Leftrightarrow\dfrac{x}{3}-4=\dfrac{15}{5}\)
\(\Leftrightarrow\dfrac{x}{3}-4=3\)
\(\Leftrightarrow\dfrac{x}{3}=3+4\)
\(\Leftrightarrow\dfrac{x}{3}=7\)
\(\Leftrightarrow x=7.3\)
\(\Leftrightarrow x=21\)
Vậy \(x=21\)
b) \(128-3\left(x+4\right)=23\)
\(\Leftrightarrow3\left(x+4\right)=128-23\)
\(\Leftrightarrow3\left(x+4\right)=105\)
\(\Leftrightarrow x+4=\dfrac{105}{3}\)
\(\Leftrightarrow x+4=35\)
\(\Leftrightarrow x=35-4\)
\(\Leftrightarrow x=31\)
Vậy \(x=31\)
c) \(\left(3x-2^4\right).7^3=2.7^4\)
\(\Leftrightarrow3x-2^4=\dfrac{2.7^4}{7^3}\)
\(\Leftrightarrow3x-2^4=2.7\)
\(\Leftrightarrow3x-2^4=14\)
\(\Leftrightarrow3x-16=14\)
\(\Leftrightarrow3x=14+16\)
\(\Leftrightarrow3x=30\)
\(\Leftrightarrow x=\dfrac{30}{3}\)
\(\Leftrightarrow x=10\)
Vậy \(x=10\)
d) \(5x+x=39-3^{11}:3^9\)
\(\Leftrightarrow6x=39-3^{11-9}\)
\(\Leftrightarrow6x=39-3^2\)
\(\Leftrightarrow6x=39-9\)
\(\Leftrightarrow6x=30\)
\(\Leftrightarrow x=\dfrac{30}{6}\)
\(\Leftrightarrow x=5\)
Vậy \(x=5\)
a) kết quả =77
b) kết quả =78
c) kết quả =4
d) kết quả 1953
a/ 6^2 : 4.3+2.5^2
=36:4.3 + 2.25
=27+50
=77
b/ 5.4^2 - 18:3^2
=5.16 - 18:9
=80-2
=78
c/ 80 - (4.5^2-3.2^3)
=80-(4.25 - 3.8)
=80- (100-24)
=80-76
=4
d/ 23.75+25+23+180
=1725+25+23+180
=1953
a) ( x-140):7=33 -23 -3
(x-140):7 = 27 - 8-3
(x-140):7 = 16
(x-140):7 = 16 .7
x-140 = 112
x-140 = 112+ 140
x = 252
23 . 163-63.23+180
= 23.( 163 - 63 + 180 )
= 23. 280
= 6440
23. 163 - 63.23 + 180
= 23 . ( 163 - 63 ) + 180
= 23 . 100 + 180
= 2300 + 180
= 2480
280 - ( 4 . 53 - 32 . 23 )
= 280 - ( 4. 125 - 9 . 23 )
= 280 - ( 500 - 207 )
= 280 - 293
133 - 3( x + 5 ) = 46
3( x + 5 ) = 133 - 46
3 ( x + 5 ) = 87
x + 5 = 87 : 3
x + 5 = 29
hok tốt ##
giải được hết chắc thiên tài toán học nhỉ 1+
Trl :
\(23.163-63.23-180\)
\(=23.\left(163-63\right)-180\)
\(=23.100-180\)
\(=2300-180\)
\(=2120\)
\(280-\left(4.5^3-3^2.23\right)\)
\(=280-\left(4.125-9.23\right)\)
\(=280-\left(500-207\right)\)
\(=280-293\)
\(=-13\)
\(133-3.\left(x+5\right)=46\)
\(\Rightarrow3.\left(x+5\right)=133-46\)
\(\Rightarrow3.\left(x+3\right)=87\)
\(\Rightarrow x+3=87:3\)
\(\Rightarrow x+3=29\)
\(\Rightarrow x=26\)
\(\left(2^3.\left|x-1\right|+3^2\right).5^7=5^9\)
\(\Rightarrow\left(8.\left|x-1\right|+9\right)=5^9-5^7\)
\(\Rightarrow\left(8.\left|x-1\right|+9\right)=5^2\)
\(\Rightarrow\left(8.\left|x-1\right|+9=25\right)\)
\(\Rightarrow8.\left|x-1\right|=25-9\)
\(\Rightarrow8.\left|x-1\right|=16\)
\(\Rightarrow\left|x-1\right|=16:8\)
\(\Rightarrow\left|x-1\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x-1=2\\x-1=-2\end{cases}}\Rightarrow\orbr{\begin{cases}x=2+1\\x=-2+1\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-3\end{cases}}\)
ghi nhầm
câu 1 :
Làm lại
\(23.163-63.23+180\)
\(=23.\left(163-63\right)+180\)
\(=23.100+180\)
\(=2300+180\)
\(=2480\)
tuyết băng ơi 23
ko phải 23
a) 23 .163 - 63 . 23 + 180 = 23 . (163 - 63) + 180 = 23 . 100 +180 = 2300 + 180 = 2480
b) 280 - ( 4 . 5^3 - 3^2 . 23) = 280 - ( 4 . 125 - 9 . 23) = 280 - ( 500 - 207 ) = 280 - 293 = - 13
c) 133 - 3 . ( x + 5) = 46
3 . (x + 5 ) =133 - 46
3 . ( x + 5 ) = 87
x + 5 = 87 / 3
x + 5 = 29
x = 29 - 5
x = 24
Vậy x = 24
d) ( 2^3 . ! x - 1! + 3^2) . 5^7 = 5^9
8 . ! x - 1 ! + 9 = 5^9 / 5^7
8 . ! x - 1 ! + 9 = 5^2
8 . ! x - 1 ! + 9 = 25
8 . ! x - 1 ! = 25 - 9
8. ! x - 1! = 16
! x- 1! = 16 / 8
! x - 1 ! = 2
! x- 1! = 2 .Có hai trường hợp :
1 ) x - 1 = 2
x = 2 - 1
x = 1
2 ) x - 1 = - 2
x = - 2 - 1
x = - 3
Vậy x = 1 , - 3
kim ngân với bé mun chắc thiên tài nhỉ