-11 - ( 19 - x ) = 50
tìm x biết:
a/ 3/2*x-70/10/11:(131313/151515+131313/353535+131313/999999)=-5
b/ 0,25*x*(8/5:1/1/2+1/50)=7/50*(2,91+0,09)*4
c/ (2/11*13+2/13*15+...+2/19*21) *462-(0,04:(x + 1,05)):0,12=19
Tìm x :
12 : x + 5 = 3 + 25 : 5
170 - 5 x ( x + 19 ) = 50
11 x ( x - 6 ) = 4 * x + 11
12 : x +5 = 3+ 5
12 : x +5 = 8
12: x = 8-5
12:x = 3
x = 12 :3
x= 4
5 x [ x + 19 ] = 170-50
5x [ x+ 19 ] = 120
x+ 19 = 120 : 5
x + 19 = 24
x = 24 -19
x = 5
11 x ( x - 6 ) = 4 * x + 11
\(\rightarrow\)11 * x - 11 x 6 = 4 * x + 11
\(\rightarrow\)11 * x - 66 = 4 * x + 11
\(\rightarrow\)11 * x - 4 * x = 66 + 11
\(\rightarrow\)( 11 - 4 ) * x = 77
\(\rightarrow\) 7 * x = 77
\(\rightarrow\) 77 : 7
\(\rightarrow\) 11
còn 2 bài trên làm như bạn nguyen ha anh 56789
tìm x
a, 12:x+5 = 3+25+5
b,170-5* (x+19)=50
c, 11* (x-6) =4* x +11
dấu * là dấu nhân nha
a) 12 : x + 5 = 33
12 : x = 33 - 5
12 : x = 28
x = 12 : 28
x = 1/4
Vậy x = 1/4
b) 5*(x + 19) = 170 - 50
5*(x+19) = 120
x + 19 = 120 : 5
x + 19 = 24
x = 24 - 19
x = 5
Vậy x = 5
c) 11*(x - 6) - 11 = 4*x
11*(x-7) = 4x
11x - 77 = 4x
11x - 4x = 77
7x = 77
x = 11
Vậy x = 11
19/1008+ 11/50
19/1008 + 11/50 = 6019/25200
rút gọn:
a, 15 x 3^11 + 4 x 2^74/ 9^7
b,2^19 x 4^16 x 3^50/ 6^51
\(\frac{10}{11}x\frac{12}{13}:\frac{50}{51}-\frac{19}{20}x\frac{12}{13}:\frac{101}{102}+\frac{99}{100}\)
11/50+19/100+28%+31/100
a,8/27+5/15+19/27+11/15
b,1/50+15/50+9/50+25/50
15-(3+2.x)=2^2
-11 - ( 19-x)=50
2x * |+4|=6
(7+x) - ( 21-13)=32
15 - ( 3 + 2x ) = 22
<=> 15 - ( 3 + 2x ) = 4
<=> 3 + 2x = 11
<=> 2x = 8
<=> x = 4
Vậy x = 4
-11 - ( 19 - x ) = 50
<=> 19 - x = -61
<=> x = 80
Vậy x = 80
2x * | +4 | = 6
<=> 2x * 4 = 6
<=> 2x = 3/2
<=> x = 3/4
Vậy x = 3/4
( 7 + x ) - ( 21 - 13 ) = 32
<=> 7 + x - 8 = 32
<=> x - 8 = 25
<=> x = 33
Vậy x = 33
*15 - ( 3 + 2x ) = 22
15 - ( 3 + 2x ) = 4
3 + 2x = 15 - 4
3 + 2x = 11
2x = 11 - 3
2x = 8
x = 8 : 2 = 4
* -11 - ( 19 - x ) = 50
19 - x = -11 - 50
19 - x = -61
x = 19 - ( -61 )
x = 80
* 2x . |+4| = 6
=> 2x . 4 = 6
2x = 6 : 4
2x = 3/2
x = 3/2 : 2 = 3/4
* ( 7 + x ) - ( 21 - 13 ) = 32
( 7 + x ) - 8 = 32
7 + x = 32 + 8
7 + x = 40
x = 40 - 7
x = 33