3. (x - 14) = -93
Tìm x thuộc N biet
1) 19+(x-23)=50
2)(273-x) -140=34
3)56-(x-14)=22
4)172-(137-x)=93
5)13.(x-14)=91
6)(13-x).17=51
a) 19 + (x - 23) = 50
x - 23 = 50 - 19
x - 23 = 31
=> x = 31 + 23
x = 54
b) (273 - x) - 140 = 34
(273 - x) = 34 + 140
(273 - x) = 174
x = 273 - 174
x = 99
c) 56 - (x - 14) = 22
x - 14 = 56 - 22
x - 14 = 34
x = 34 + 14
x = 48
d) 172 - (137 - x) = 93
137 - x = 172 - 93
137 - x = 79
x = 137 - 79
x = 58
e) 13. (x - 14) = 91
x - 14 = 91 : 13
x - 14 = 7
x = 14 + 7
x = 21
g) (13 - x).17 = 51
13 - x = 51 : 17
13 - x = 3
x = 13 - 3
x = 10
chúc bn học giỏi ^^ !
ok mk nha!! ! 5654645645767676576558578779769675634636457567687689978978978978766876765657886567567
1.19+(x-23)=50
<=>x-23=50-19
<=>x-23=31
<=>x=31+23
<=.x=54
vậy x=54
2.(273-x)-140=34
<=>273-x=34+140
<=>273-x=174
<=>x=273-174
<=>x=99(thoả mãn)
vậy x=99
Tìm x biet:
a,93/17:x+(-21/17):x+22/7:22/3=5/14
b,-32/27-(3x-7/9)^3=-24/27
c,[(3,75:1/4)+12/5.125%)-(7/2.0,8-1,2:3/2)]:(3/2+0,75)x=64
a; \(\dfrac{93}{17}\): \(x\) + (- \(\dfrac{21}{17}\)) : \(x\) + \(\dfrac{22}{7}\): \(\dfrac{22}{3}\) = \(\dfrac{5}{14}\)
\(\dfrac{94}{17}\) \(\times\) \(\dfrac{1}{x}\) - \(\dfrac{21}{17}\) \(\times\) \(\dfrac{1}{x}\) + \(\dfrac{3}{7}\) = \(\dfrac{5}{14}\)
\(\dfrac{72}{17}\) \(\times\) \(\dfrac{1}{x}\) + \(\dfrac{3}{7}\) = \(\dfrac{5}{14}\)
\(\dfrac{72}{17x}\) = \(\dfrac{5}{14}\) - \(\dfrac{3}{7}\)
\(\dfrac{72}{17x}\) = - \(\dfrac{1}{14}\)
17\(x\) = 72.(-14)
17\(x\) = - 1008
\(x\) = - 1008 : 17
\(x\) = - \(\dfrac{1008}{17}\)
Vậy \(x\) \(=-\dfrac{1008}{17}\)
b; - \(\dfrac{32}{27}\) - (3\(x\) - \(\dfrac{7}{9}\))3 = - \(\dfrac{24}{27}\)
- \(\dfrac{32}{27}\) + \(\dfrac{24}{27}\) = (3\(x\) - \(\dfrac{7}{9}\))3
(3\(x-\dfrac{7}{9}\))3 = - \(\dfrac{8}{27}\)
(3\(x-\dfrac{7}{9}\))3 = (- \(\dfrac{2}{3}\))3
3\(x-\dfrac{7}{9}\) = - \(\dfrac{2}{3}\)
3\(x\) = - \(\dfrac{2}{3}\) + \(\dfrac{7}{9}\)
3\(x\) = \(\dfrac{1}{9}\)
\(x\) = \(\dfrac{1}{9}\) : 3
\(x\) = \(\dfrac{1}{27}\)
Vậy \(x=\dfrac{1}{27}\)
tìm x∈N biết
56-( x - 14 )=22
172-(137-x )=93
56 - ( x - 14 ) = 22
x - 14 = 56 - 22
x - 14 = 34
x = 34 + 14
x = 48
172 - ( 137 - x ) = 93
137 - x = 172 - 93
137 - x = 79
x = 137 - 79
x = 58
1/ 56 - (x - 14) = 22 => x - 14 = 56 - 22 => x - 14 = 34 => x = 34 + 14 => x = 48
2/ 172 - (137 - x) = 93 => 137 - x = 172 - 93 => 137 - x = 79 => x = 137 - 79 => x = 58
tính
4/9 + 7/63
9 + 2/5
17/18 - 3/9
3 - 14/15
4/9 + 7/63 = 28/63 + 7/63 = 35/63
9 + 2/5 = 45/5 + 2/5 = 47/5
17/18 - 3/9 = 17/18 - 6/18 = 11/18
3 - 14/15 = 75/15 - 14/15 = 61/15
LY: Tự rút gọn (nếu cần)
Tìm x ∈ ℕ , biết:
a ) − 2 5 + 1 6 + − 1 5 ≤ x < − 3 4 + 9 7 + − 1 4 + 5 7 b ) 5 17 + − 4 9 + 12 17 < x ≤ − 3 7 + 7 15 + 4 − 7 + 8 15 + 9 3
a ) − 13 30 ≤ x < 1 = > x = 0. b ) 5 9 < x ≤ 3 = > x ∈ {1;2;3}
B1 So sanh cac so sau
a) x=-3/17; y =-15/14
b) x=29/59;y=47/93
c) x=-79/137;y-1/1000
d)x= 415/326;y=294/487
Tìm x thuộc Z, biết:
a) − 2 5 + 1 6 + − 1 5 ≤ x < − 3 4 + 9 7 + − 1 4 + 5 7
b) 5 17 + − 4 9 + 12 17 < x ≤ − 3 7 + 7 15 + 4 − 7 + 8 15 + 9 3
a) − 2 5 + 1 6 + − 1 5 ≤ x < − 3 4 + 9 7 + − 1 4 + 5 7 ⇔ − 13 30 ≤ x ≤ 1 ⇔ x ∈ 0 ; 1
b) 5 17 + − 4 9 + 12 17 < x ≤ − 3 7 + 7 15 + 4 − 7 + 8 15 + 9 3 ⇔ 5 9 < x ≤ 3 ⇔ x ∈ 1 ; 2 ; 3
( 158 + 154 ) × 32 - 284 × 35
( 873 - 586 ) × 25 + ( 315 + 289 )
Bài 2 :
65 + x + 95784 = 101569
87 : x + 93 : x - 66 : x = 38
x : 2 + x × 4 = 7
( x : 42 ) + 457 = 625
Bài 3 :
7/2 + 5/14 + 1/7 + 3/14
1995 × 1997 - 1 / 1996 × 1995 + 1994
469 × 281 + 469 × 718
( 158 + 154 ) × 32 - 284 × 35
( 873 - 586 ) × 25 + ( 315 + 289 )
Bài 3 :
65 + x + 95784 = 101569
87 : x + 93 : x - 66 : x = 38
x : 2 + x × 4 = 7
( x : 42 ) + 457 = 625
Bài 4 : 7/2 + 5/14 + 1/7 + 3/14
19995 × 1997 - 1 / 1996 × 1995 + 1994
469 × 281 + 469 × 719