tìm x : x + 16 + 36 < 56 + 4
Tìm x biết:
a)58+7x=100
b)3x - 7=28
c)x - 56:4=16
d)101+(36-4x)=105
e) (x - 12 ) : 12 = 12
f) (3.x-24).73=2.74
i) (10+2x) .42011=42013
a) \(58+7x=100\)
\(=>7x=100-58\)
\(=>7x=42\)
\(=>x=42:7\)
\(=>x=6\)
b) \(3x-7=28\)
\(=>3x=28+7\)
\(=>3x=35\)
\(=>x=35:3\)
\(=>x=\dfrac{35}{3}\)
c) \(x-56:4=16\)
\(=>x-14=16\)
\(=>x=16+14\)
\(=>x=30\)
d) \(101+\left(36-4x\right)=105\)
\(=>36-4x=105-101\)
\(=>36-4x=4\)
\(=>4x=36-4\)
\(=>4x=32\)
\(=>x=32:4\)
\(=>x=8\)
e) \(\left(x-12\right):12=12\)
\(=>x-12=12.12\)
\(=>x-12=144\)
\(=>x=144-12\)
\(=>x=132\)
f) \(\left(3x-2^4\right).7^3=2.7^4\)
\(=>3x-2^4=2.7^4:7^3\)
\(=>3x-16=2.7=14\)
\(=>3x=14+16\)
\(=>3x=30\)
\(=>x=30:3\)
\(=>x=10\)
i) \(\left(10+2x\right).4^{2011}=4^{2013}\)
\(=>10+2x=4^{2013}:4^{2011}\)
\(=>10+2x=4^2=16\)
\(=>2x=16-10\)
\(=>2x=6\)
\(=>x=6:2\)
\(=>x=3\)
\(#WendyDang\)
Tìm x biết:
a) 58 + 7x = 100 b) 5x – 7 = 28 c) x – 56 : 4 = 16 d) 101 + (36 – 4x) =105 e) ( x – 12) : 12 = 12 f) (3.x – 24) . 73 = 2.74 g) 71 – (33 + x) = 26 h) 45 – (x + 9):2 = 6 i) 2. (x + 7) – 25 = 13 | k) 2 (x – 51) = 2.23 + 20 l) 450 : (x – 19) = 50 m) 100 – (x – 3) : 2 = 72 – 110 n) 140 : (x – 8) = 7 o) 4 (x + 41) = 400 p) 5 (x – 9) = 350 q) 2x – 49 = 5 . 32 r) 200 – (2x + 6) = 43 s) 135 – 5.(x + 4) = 35 |
a: =>7x=42
hay x=6
b: =>5x=35
hay x=7
c: =>x-14=16
hay x=30
d: =>36-4x=4
=>4x=32
hay x=8
e: =>x-12=144
hay x=156
f: =>3x-16=14
hay x=10
g: =>x+33=45
hay x=12
h: =>(x+9):2=39
=>x+9=78
hay x=69
a: =>7x=42
hay x=6
b: =>5x=35
hay x=7
c: =>x-14=16
hay x=30
d: =>36-4x=4
=>4x=32
Bài 3: Tính nhanh các giá trị biểu thức dưới đây:
a) 576 + 678 + 780 – 475 - 577 - 679
b) (126 + 32) x (18 - 16 - 2)
c) 36 x 17 x 12 x 34 + 6 x 30
Bài 4: Tìm X:
a) X x 6 = 3048 : 2
b) 56 : X = 1326 – 1318
giúp mik nữa với
Bài 3a) 576 + 678 + 780 - 475 - 577 - 679
= ( 578 - 475 ) + ( 678 - 577 ) + ( 780 - 679 )
= 103 + 101 + 101
= 305
b) ( 126 + 32 ) x ( 18 - 16 - 2 )
= 158 x 0
= 0
c) 36 x 17 + 12 x 34 + 6 x 30
= 6 x 6 x 17 + 6 x 2 x 34 + 6 x 30
= 6 x 102 + 6 x 68 + 6 x 30
= 6 x ( 102 + 68 + 30 )
= 6 x 200
= 1200
Bài 4:a. x × 6 = 3048 : 2
x × 6 = 1524
x = 1524 : 6
x = 254
b. 56 : x = 1326 – 1318
56 : x = 8
x = 56 : 8
x = 7
Bài 4:
a) Ta có: \(x\cdot6=3048:2\)
nên 6x=1524
hay x=254
b) Ta có: 56:x=1326-1318
nên 56:x=8
hay x=7
x -56 : 4= 16
101 +(36 –4x) =105
2(x-51) = 2.23+ 20
10 -(x –3): 2 = 72–110
2x –49 = 5.32
[(8x -12) : 4].33= 36
52x –3–2 . 52= 52. 3
(x3–7) : 4 = 5
a: x-56:4=16
nên x-14=16
hay x=30
b: \(101+\left(36-4x\right)=105\)
\(\Leftrightarrow36-4x=4\)
hay x=8
Vì a: x-56:4=16
=>x-14=16
Hay:x=30
Vì b: 101+(36−4x)=105101+(36−4x)=105
⇔36−4x=4⇔36−4x=4
Hay:x=8
Vậy x={30:8}
Nếu sai thì thui nhá,đừng chửi mình!
Tính:
a) (37 – 18) + 17
b) 56 – (35 – 16)
c) (6 + 5) x 8
d) 36 : (62 – 56)
a) (37 – 18) + 17 = 19 + 17 = 36
b) 56 – (35 – 16) = 56 – 19 = 37
c) (6 + 5) x 8 = 11 × 8 = 88
d) 36 : (62 – 56) = 36 : 6 = 6
THUC HIEN PHEP TINH ( TINH NHANH NEU CO THE ) :
1) ( 56 x 46 - 25 x 23 ) : 23
2) ( 28 x 54 + 56 x 36 ) : 21 : 2
3) ( 76 x 34 - 19 x 64 ) : ( 38 x 9 )
4) ( 2 + 4 + 6 + .... + 100 ) x ( 36 x 333 - 108 x 111 )
5) ( 5x 411 - 3 x 165 ) : 410
6) 7256 x 4375 - 725
3650 + 4375 x 7255
Tìm x biết:
a, (x + 72) × 4 = 320
b, (x - 56) × 7 = 749
c, (x + 3) × 4 = 36
d, (x - 5) × 6 = 72
Bài 3. Tìm x. x/36 = 3/4 ; x/7 = 56/49 ; 15/27 = 5/x ; 3/7 = 42/x
1/ Tìm y:
a) y x 42 = 4200
b) y : 42 = 200
2/ Tính nhanh:
a) 21 x 34 + 21 x 16
b) 34 x 56 + 56 x 36
Ai tk mk mk tk lại
1/ Tìm y
a) y x 42 = 4200
y = 4200 : 42
y = 100
b) y : 42 = 200
y = 200 x 42
y = 8400
2/ Tính nhanh
a) 21 x 34 + 21 x 16
= 21 x ( 34 + 16 )
= 21 x 50
= 1050
b) 34 x 56 + 56 x 36
= 56 x ( 34 + 36 )
= 56 x 70
= 3920
1/ Tìm y :
a) y x 42 = 4200
y = 4200 : 42
y = 100
b) y : 42 = 200
y = 200 x 42
y = 8400
2/ tính nhanh
a) 21 x 24 + 21 x 16
= 21 x (24 + 16)
= 21 x 40
= 840
b) 34 x 56 + 56 x 36
= (34 + 36) x 56
= 70 x 56
= 3920
k mik nha bn
1/ Tìm y :
a) y x 42 = 4200
y = 4200 : 42
y = 100
b) y : 42 = 200
y = 200 x 42
y = 8400
2/ Tính nhanh:
a) 21 x 34 + 21 x 16
= 21 x ( 34 + 16 )
= 21 x 50
= 1050
b) 34 x 56 + 56 x 36
= 56 x ( 34 + 36 )
= 56 x 70
= 3920
Ai tk mk mk tk lại