Tìm x:
a, 89 - ( 73-x ) = 20
b, 140 : ( x-8 ) = 7
Bài3:Tìm x:
a) 71 – (33 + x) = 26 b) (x + 73) – 26 = 76 c) 45 – (x + 9) = 6 d) 89 – (73 – x) = 20 e) 4(x + 41) = 400 f) 11(x – 9) = 77 | g) (x + 7) – 25 = 13 h) 198 – (x + 4) = 120 i) 5(x – 9) = 350 j) 2x – 49 = 5.32 k) 25 + 3(x – 8) = 106 l) 32(x + 4) – 52 = 5.22 | m) 200 – (2x + 6) = 43 n) 2(x- 51) = 2.23 + 20 o) 450 : (x – 19) = 50 p) 4(x – 3) = 72 – 110 q) 156 – (x+ 61) = 82 r) (x-35) -120 = 0 |
a: Ta có: \(71-\left(x+33\right)=26\)
\(\Leftrightarrow x+33=45\)
hay x=12
b: Ta có: \(\left(x+73\right)-26=76\)
\(\Leftrightarrow x+73=102\)
hay x=29
c: Ta có: \(45-\left(x+9\right)=6\)
\(\Leftrightarrow x+9=39\)
hay x=30
a) 71 - ( 33 + x ) = 26
(33 + x ) = 71 -26
33 + x = 45
x = 45 - 33 = 12
b) ( x + 73 ) - 26 = 76
( x + 73 ) = 102
x = 102 - 73 = 29
c) 45 - ( x + 9 ) = 6
( x + 9 ) = 45 - 6 = 39
x = 39 - 9 = 30
d) 89 - ( 73 - x ) = 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69 = 4
e) 4(x+41) = 400
x + 41 = 400 : 4 = 100
x = 100 - 41 = 59
f) 11(x-9 ) = 77
x - 9 = 77 : 11 = 7
x = 7 + 9 = 16
g) x + 7 = 25 + 13 = 38
x = 38 - 7 = 31
h) x + 4 = 198 - 120 = 78
x = 78 - 4 = 74
i) x - 9 = 350 : 5 = 70
x = 70 + 9 = 79
j) 2x - 49 = 5 . 9 = 45
2x = 45 + 49 = 94
x = 94 : 2 = 47
k) 25 + 3( x - 8 ) = 106
3(x-8 ) = 106 - 25 = 81
x - 8 = 81 : 3 = 27
x = 27 +8= 35
l) 9( x + 4 ) - 25 = 20
9( x + 4 ) = 20 + 25 = 45
x + 4 =45 : 9 = 5
x = 5 - 4 = 1
m) 200 - ( 2x + 6 ) = 64
2x + 6 = 200 - 64 = 136
2x = 136 - 6 = 130
x = 130 : 2 = 65
n) 2(x-51) = 16 + 20 = 36
x - 51 = 36 : 2 = 13
x = 13 + 51 = 64
o) 450 : ( x - 19 ) = 50
x - 19 = 450 : 50 = 9
x = 19 + 9 = 28
p)4(x-3) = 49 - 1 = 48
x - 3 = 48 : 4 = 12
x + 15
q) 156 - ( x+61 ) = 82
x + 61 = 156 - 82 = 74
x = 74 - 61 = 13
r) ( x - 35 ) - 120 = 0
x - 35 = 120
x = 120 + 35 = 155
1. Tìm x
a) 71-(33+x)=26
b) ( x+73)-26=76
c)45-(x+9)=6
d) 89-(73-x)=20
e) ( x+7)-25=13
f)198-(x+4)=120
g)140:(x-8)=7
h) 4(x+41)=400
a) \(\Leftrightarrow-x+38=26\)
\(\Leftrightarrow x=12\)
b)\(\Leftrightarrow x+47=76\)
\(\Leftrightarrow x=29\)
c)\(\Leftrightarrow-x+36=6\)
\(\Leftrightarrow x=30\)
d)\(\Leftrightarrow x+16=20\)
\(\Leftrightarrow x=4\)
e)\(x-18=13\)
\(\Leftrightarrow x=31\)
f)\(-x+194=120\)
\(\Leftrightarrow x=74\)
g)\(\Leftrightarrow x-8=20\)
\(\Leftrightarrow x=28\)
h)\(\Leftrightarrow4x+84=400\)
\(\Leftrightarrow x=79\)
a) 71-(33+x)=26
33+x=71-26
33+x=45
x=45-33
x=12
Vậy x=12
b) ( x+73)-26=76
x+73=76+26
x+73=102
x=102-73
x=29
Vậy x=29
c)45-(x+9)=6
x+9=45-6
x+9=39
x=39-9
x=30
Vậy x=30
d) 89-(73-x)=20
73-x=89-20
73-x=69
x=73-69
x=4
Vậy x=4
e) ( x+7)-25=13
x+7=13+25
x+7=38
x=38-7
x=31
Vậy x=31
f)198-(x+4)=120
x+4=198-120
x+4=78
x=78-4
x=74
Vậy x=74
g)140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
Vậy x=28
h) 4(x+41)=400
x+41=400:4
x+41=100
x=100-41
x=59
Vậy x=59
Bài 1
a) 71-(33+x)=26
33+x=71-26
33+x=45
x=45-33
x=12
Vậy x=12
b) ( x+73)-26=76
x+73=76+26
x+73=102
x=102-73
x=29
Vậy x=29
c)45-(x+9)=6
x+9=45-6
x+9=39
x=39-9
x=30
Vậy x=30
d) 89-(73-x)=20
73-x=89-20
73-x=69
x=73-69
x=4
Vậy x=4
e) ( x+7)-25=13
x+7=13+25
x+7=38
x=38-7
x=31
Vậy x=31
f)198-(x+4)=120
x+4=198-120
x+4=78
x=78-4
x=74
Vậy x=74
g)140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
Vậy x=28
h) 4(x+41)=400
x+41=400:4
x+41=100
x=100-41
x=59
Vậy x=59
Tìm x, biết
a, 89 - (73 - x) = 20
b, 140 : ( x - 8 ) = 7
c, 4.(x + 41) = 400
d, x - [42 + (-28) = -8
e, 2ˣ + ¹ . 2^2014 = 2^2015
g, 4ˣ = 64
h, x^4 = 16
f, 9ˣ - ¹ = 9
j, 2ˣ : 2^5 = 1
\(a,89-\left(73-x\right)=20\)
\(\Rightarrow80-73+x=20\)
\(\Rightarrow7+x=20\)
\(\Rightarrow x=20-7=13\)
\(b,140:\left(x-8\right)=7\)
\(\Rightarrow x-8=140:7=20\)
\(\Rightarrow x=20+8=28\)
\(c,4\left(x+41\right)=400\)
\(\Rightarrow x+41=400:4=100\)
\(\Rightarrow x=100-41=59\)
Bài 3: Tìm x e Z:
1) 71 – (33 + x)= 26
2) (x + 73) – 26 = 76
3) x - 7 = -5
4) -23 +x = - (- 25)
5) -5 < x ≤ 6
6) 140 : (x – 8) = 7
1, <=>33+x=45
<=> x = 12
Vậy x=12
2, <=>x+73 =102
<=> x =29
3,x=2
4, -23+x=25<=>x=2
6, x-8=20<=>x=28
Bài 2. tìm số nguyên x,biết
a,87-(73-x)=20
b,575-(6x+70)=445
c,(7.x-11)mũ 3 = 2 mũ 5.5 mũ 2=200
a: \(\Leftrightarrow73-x=67\)
hay x=6
1. tìm x
a. 71-(33+x)=26
b. (x+73)-26=76
c. 45-(x+9)=6
d. 89-(73-x)=20
e. (x+7)-25=13
f. 198-(x+4)=120
g. 140:(x-8)=7
h. 4(x+41)=400
i. 11(x-9)=77
j. 5(x-9)=350
k. 2x-49=5 .3 mũ 2
l.200-(2x+6)=4 mũ 3
a) 71 - (33 + x) = 26
⇔ 71 - 33 - x = 26
⇔ 38 - x = 26
⇔ x = 38 - 26
⇔ x = 12
b) (x + 73) - 26 = 76
⇔ x + 73 - 26 = 76
⇔ x + 47 = 76
⇔ x = 76 - 47
⇔ x = 29
c) 45 - (x + 9) = 6
⇔ 45 - x - 9 = 6
⇔ 36 - x = 6
⇔ x = 36 - 6
⇔ x = 30
d) 89 - (73 - x) = 20
⇔ 89 - 73 + x = 20
⇔ 16 + x = 20
⇔ x = 20 - 16
⇔ x = 4
e) (x + 7) - 25 = 13
⇔ x + 7 - 25 = 13
⇔ x - 18 = 13
⇔ x = 13 + 18
⇔ x = 31
f) 198 - (x + 4) = 120
⇔ 198 - x - 4 = 120
⇔ 194 - x = 120
⇔ x = 194 - 120
⇔ x = 74
g) 140 : (x - 8) = 7
⇔ x - 8 = 140 : 7
⇔ x - 8 = 20
⇔ x = 20 + 8
⇔ x = 28
h) 4(x + 41) = 400
⇔ x + 41 = 400 : 4
⇔ x + 41 = 100
⇔ x = 100 - 41
⇔ x = 59
i) 11(x - 9) = 77
⇔ x - 9 = 77 : 11
⇔ x - 9 = 7
⇔ x = 7 + 9
⇔ x = 16
j) 5(x - 9) = 350
⇔ x - 9 = 350 : 5
⇔ x - 9 = 70
⇔ x = 70 + 9
⇔ x = 79
k) 2x - 49 = 5.32
⇔ 2x - 49 = 45
⇔ 2x = 45 + 49
⇔ 2x = 94
⇔ x = 94 : 2
⇔ x = 47
l) 200 - (2x + 6) = 43
⇔ 200 - 2x - 6 = 64
⇔ 194 - 2x = 64
⇔ 2x = 194 - 64
⇔ 2x = 130
⇔ x = 130 : 2
⇔ x = 65
a) 71 - (33 + x) = 26
⇔ 33+x=71-26
⇔ 33 + x = 45
⇔ x = 45 - 33
⇔ x = 12
Vậy x=12
b) (x + 73) - 26 = 76
⇔ (x + 73) = 76+26
⇔ x + 73 = 102
⇔ x = 102-73
⇔ x = 29
Vậy x=29
c) 45 - (x + 9) = 6
⇔ x + 9 = 45 - 6
⇔ x+9 = 39
⇔ x = 39 - 9
⇔ x = 30
Vậy x=30
d) 89 - (73 - x) = 20
⇔ 73 - x = 89 - 20
⇔ 73 - x = 69
⇔ x = 73 - 69
⇔ x = 4
Vậy x=4
e) (x + 7) - 25 = 13
⇔ x + 7 = 13 + 25
⇔ x + 7 = 38
⇔ x = 38 - 7
⇔ x = 31
Vậy x=31
f) 198 - (x + 4) = 120
⇔ x + 4 = 198 -120
⇔ x + 4 = 78
⇔ x = 78 - 4
⇔ x = 74
Vậy x=74
tìm x
a, 89-(73-x)=20
b, (x+7)-25=13
c, 98-(x+4)=20
d, 140:(x-8)=7
e, 4(x+41)=400
f, x-[42+(-28)]=-8
g, x+5=20-(12-7)
h, (x-11)=2.2^3+20:5
i, 4(x-3)=7^2-1^3
k, 1/7=8/-x
m, 3x/9=2/6
giúp nhé!!!!!!!
2, Tìm x:
a) 45 + x = 79 + 2x
b) 15 - (x + 7) = (x - 8) +22
c) |x| = 5
d) x - ƯCLN(16; 24) = 7
Bài 2:
a: Ta có: \(2x+79=x+45\)
nên 2x-x=45-79
hay x=-24
b: Ta có: \(15-\left(x+7\right)=\left(x-8\right)+22\)
\(\Leftrightarrow8-x-x-14=0\)
\(\Leftrightarrow2x=22\)
hay x=11
Tìm x:
a, 9/7 : x = 3/5
b, x + 1/3 = 8/6 - 1/2
a) \(\dfrac{9}{7}\div x=\dfrac{3}{5}\)
\(x=\dfrac{9}{7}\div\dfrac{3}{5}\)
\(x=\dfrac{15}{7}\)
b) \(x+\dfrac{1}{3}=\dfrac{8}{6}-\dfrac{1}{2}\)
\(x+\dfrac{1}{3}=\dfrac{5}{6}\)
\(x=\dfrac{5}{6}-\dfrac{1}{3}\)
\(x=\dfrac{1}{2}\)
a) x = 3/5 x 9/7
x = 27/35
b) x+ 1/3 = 5/6
x = 5/6 - 1/3
x = 1/2
a)\(=>x=\dfrac{9}{7}:\dfrac{3}{5}=\dfrac{15}{7}\)
b)\(x=\left(\dfrac{8}{6}-\dfrac{1}{2}\right)-\dfrac{1}{3}=\dfrac{1}{2}\)