1 . 3.2x - 3 = 45
2 . 2448 : [ 119 - ( x - 6 ) ] = 0
3. 4x3 + 12 = 120
a)3.2x -3=45
b)4x3 +12=120
c)1500:[(36x+40):x]=30
3.2x—3=45
3.2x=45+3
3.2x=48
2x=48:3
2x=16
x=16:2
x=8
4x .3+12=120
4x.3=120–12
4x.3=108
4x=108:3
4x=36
x=36:4
x=9
\(3.2x-3=45\)
\(3.2x=45+3\)
\(3.2x=48\)
\(2x=\frac{48}{3}\)
\(2x=16\)
\(x=8\)
Vậy \(x=8\)
\(1500:\left[\left(36x+40\right):x\right]=30\)
\(\left(36x+40\right):x=1500:30\)
\(36x+40=50x\)
\(50x-36x=40\)
\(14x=40\)
\(x=\frac{40}{14}\)
\(x=\frac{20}{7}\)
Vậy \(x=\frac{20}{7}\)
a)3.2x-3 = 45
3.(2x-1) = 45
2x-1 = 45 : 3
2x-1 = 15
2x = 16
x = 8
các bài cn lại bn dựa vào phần a mak lm nha!
Bài 2 tìm X biết:
a) 2448 : ( 119 - ( X - 6 ) = 24
b) ( X + 1) + ( X+ 3 ) + (X + 5 ) + ...+( X+99) = 2550
Giải hộ mik với
Câu b,
= 50x + (1 + 3 + 5 + ..... + 99) = 2550
= 50x + 2500 = 2550
= 50x = 2550 - 2500
= 50x = 50
= x = 50 : 50
= x = 1
refer
A) 2448:[119-[x-6]]=24
<=> 199 - ( x-6 ) = 2448 : 24 = 102
<=> x - 6 = 199 - 102 = 97
<=> x = 97 +6 = 103
B) (x+1)+(x+3)+(x+5)+......+(x+99) = 2550
(x+x+x+....+x)+(1+3+5+....+99) = 2550
50x + 2500 = 2550
50x = 2550 - 2500
50x = 50
x = 50 : 50
x = 1
a) ( 136,5 - x ) * 1,2 = 5,4
b) 18 : ( 372 : 3 * x - 1) = 6
c) [ ( 6 * x - 39 ) : 7 ] * 4 = 12
d) 2448 : [ 119 - ( x - 6 ) ] = 24
Nhanh hộ mình nhé ^ ^
Thanks!
Trả lời
a)(136,5-x).1,2=5,4
136,5-x =5,4:1,2
136,5-x =4,5
x =136,5+4,5
x =141
b)18:(372:3.x-1)=6
372:3x-1 =18:6
372:3x-1 =3
372:3x =3+1
372:3x =4
3x =372:4
3x =93
x =93:3
x =31
c)[(6.x-39):7].4=12
(6x-39):7 =12:4
(6x-39):7 =3
6x-39 =3.7
6x-39 =21
6x =21+39
6x =60
x =60:6
x =10
d)2448:[119-(x-6)]=24
119-(x-6)=2448:24
119-(x-6)=102
x-6 =119-102
x-6 =17
x =17+6
x =23
Chúc bạn học tốt !
a, ( 136,5 - X ) x 1,2 = 5,4
=> 136,5 - X = 5,4 : 1,2
=> 136,5 - X = 4,5
=> X = 136,5 - 4,5
=> X = 132
b, hình như sai đề bạn ơi
c, [ ( 6 x X - 39 ) : 7 ] x 4 = 12
=> ( 6 x X - 39 ) : 7 = 12 : 4
=> ( 6 x X - 39 ) :7 = 3
=> 6 x X - 39 = 3 x 7
=> 6 x X - 39 = 21
=> 6 x X = 60
=> X = 60 : 6
=> X = 10
d, 2448 : [ 119 - ( x - 6 ) ] = 24
=> 119 - ( x - 6 ) = 2448 : 24
=> 119 - ( x - 6 ) = 102
=> x - 6 = 119 - 102
=> x - 6 = 17
=> x = 17 + 6
=> x = 23
Cho mk hỏi,
Ai tk sai zậy ạ
Chỉ mk chỗ sai để mk rút kinh nghiệm ạ !
tìm x
2448:[119-(x-6)]=24
(6x-39):7x4= 12
720:[41-(2x-5)]=8,5
1+2+3+4+.........+(x-1)+x =78
giải nhanh giúp mình nha cảm ơn các bạn nhiều
Mình không chép lại đề nha
a)119-(x-6)=102
x-6 =17
x =23
b)(6x-39):7=3
6x-39 =21
6x =60
x =10
c, d bạn tự làm nha
Tính nhanh
1) 25+91+75+101=
2)41x39-41x9=
3) 710x99+710=
4)17x85+15x17-120=
5) (39x42-37x42):42
6) 120-48-52
7) 23x75+25x23+180
8) 2448 : [ 119- (23-6) ]
1) 25 + 91 + 75 + 101
= (25+75) + (91 + 101)
= 100 + 192
= 292
2) 41 x 39 - 41 x 9
= 41 x (39 - 9)
= 41 x 30
= 1230
3) 710 x 99 + 710
= 710 x 99 + 710 x 1
= 710 x (99 + 1)
= 710 x 100
= 71000
4) 17 x 85 + 15 x 17 - 120
= 17 x (85 + 15) - 120
= 17 x 100 -120
= 1700 -120
= 1580
5) (39 x 42 - 37 x 42) : 42
= 42 x (39 - 37) : 42
= 42 x 2 : 42
= 84 : 42
=2
6) 120 - 48 - 52
= 120 - (48 + 52)
= 120 - 100
= 20
7) 23 x 75 + 25 x 23 + 180
= 23 x (75 + 25) +180
= 23 x (75 + 25) +180
= 23 x 100 + 180
= 2300 +180
=2480
8) 2448 : [119 - (23 - 6)]
= 2448 : (119 - 17)
= 2448 : 102
= 24
1) Tìm x
a) (x+12)-20=0
b) 5.(x-7)=0
c) 12x-3x+1=937
d) 2448 : [ 119 - ( x - 6 ) ] = 24
a) (x+12)-20=0
x+12=20
x=8
b) 5.(x-7)=0
x-7=0
x=7
c) 12x-3x+1=937
12x-3x=936
9x=936
x=104
d) 2448 : [ 119 - ( x - 6 ) ] = 24
119-(x-6) = 102
x-6=17
x=23
a ) ( x + 12 ) - 20 = 0
x + 12 = 0 + 20
x +12 = 20
x = 20 - 12
x = 8
b ) 5 . ( x - 7 ) =0
x - 7 = 0 : 5
x - 7 = 0
x = 0 + 7
x = 7
a) => x+12=0+20=20
=> x=20-12=8
b) =>x-7=0:5=0
=>x=0+7=7
c) => 15x+1=937
=>15x=937-1=936
=> x= 936:15=62,4
d) => 119-(x-6)=2448:24=102
=>x-6=119-102=17
=>x=17+6=23
Chọn mình nha . cảm ơn!!!! chúc bạn học tốt nha
2448:[119-(x-6)]=24
`2448:[119-(x-6)]=24`
`=>119-(x-6)= 2448 : 24`
`=>119-(x-6)= 102`
`=> x-6=119-102`
`=> x-6=17`
`=>x=17+6`
`=>x=23`
`2448:[119-(x-6)]=24`
`=>119-(x-6)= 2448 : 24`
`=>119-(x-6)= 102`
`=> x-6=119-102`
`=> x-6=17`
`=>x=17+6`
`=>x=23`
Tìm STN x
2448:[119-(x-6)]= 24
2016-100.(x+11)=27:23
\(2448:\left[119-\left(x-6\right)\right]=24\)
\(119-\left(x-6\right)=2448:24\)
\(119-\left(x-6\right)=102\)
\(x-6=119-102\)
\(x-6=17\)
\(x=17+6\)
\(x=23\)( thỏa mãn \(x\in N\) )
vậy x = 23
\(2016-100\cdot\left(x+11\right)=2^7:2^3\)
\(2016-100\cdot\left(x+11\right)=128:8\)
\(2016-100\cdot\left(x+11\right)=16\)
\(100\cdot\left(x+11\right)=2016-16\)
\(100\cdot\left(x+11\right)=2000\)
\(x+11=2000:100\)
\(x+11=20\)
\(x=20-11\)
\(x=9\)( thỏa mãn \(x\in N\))
vậy x = 9
1) 2448 : [ 119 - (x - 6)] = 24
=> 119 - (x - 6) = 2448 : 24
=> 119 - x + 6 = 102
=> 125 - x = 102
=> x = 125 - 102 = 23 (thỏa mãn x thuộc N)
Vậy x = 23
2) 2016 - 100.(x + 11) = 2^7 : 2^3
=> 2016 - 100.(x + 11) = 2^4 = 16
=> 100.(x+11) = 2016 - 16 = 2000
=> x + 11 = 2000 : 100 = 20
=> x = 20 -11 = 9 ( thỏa mãn)
Vậy x =9
a) 10-{[(x:3+17):10+3.24 ]:10}=5
b) 2448:[119-(x-6)]=24
c)165-(35:x+3).19=13
a: Ta có: \(10-\left\{\left[\left(x:3+17\right):10+3\cdot2^4\right]:10\right\}=5\)
\(\Leftrightarrow\left[\left(x:3+17\right):10+48\right]:10=5\)
\(\Leftrightarrow\left(x:3+17\right):10+48=50\)
\(\Leftrightarrow\left(x:3+17\right):10=2\)
\(\Leftrightarrow x:3+17=20\)
\(\Leftrightarrow x:3=3\)
hay x=9
b: Ta có: \(2448:\left[119-\left(x-6\right)\right]=24\)
\(\Leftrightarrow119-\left(x-6\right)=102\)
\(\Leftrightarrow x-6=17\)
hay x=23
c: Ta có: \(165-\left(35:x+3\right)\cdot19=13\)
\(\Leftrightarrow\left(35:x+3\right)\cdot19=152\)
\(\Leftrightarrow\left(35:x+3\right)=8\)
\(\Leftrightarrow35:x=5\)
hay x=7