c) 4x : 17 = 0
d) 7x - 8 = 713
e) 8( x - 3 ) = 0
a) 4x : 17 =0
b) 7x - 8 = 713
c) 8(x - 3) = 0
a) 4x : 17 = 0
b) 7x - 8 = 713
c) 8( x - 3) = 0
d) 0 : x = 0
a. 4x : 17 = 0 <=> 4x = 0.17 = 0 => x = 0
b. 7x- 8 =713 <=> 7x = 713 + 8 = 721 => x = 721 : 7 = 103
c. 8 ( x - 3) = 0 <=> x - 3 = 0: 8 = 0 => x = 3
d. 0 : x = 0 với mọi x khác 0
a. 4x : 17 = 0
b. 7x - 8 = 713
c. 8(x - 3) = 0
a) 4X : 17 = 0
4X= 0 x17
4X = 0
X = 0 : 4
X = 0
Vậy X = 0
b) 7X - 8 = 713
7X = 713 + 8
7X = 721
X = 721 : 7
X = 103
Vậy X = 103
c) 8 ( X - 3 ) = 0
X - 3 = 0 : 8
X - 3 = 0
X = 0 + 3
X = 3
Vậy X = 3
a. 4x : 17 = 0
=> 4x=0.17
=> 4x=0
=> x=0:4
=> x=0
b. 7x - 8 = 713
=> 7x=713+8
=> 7x = 721
=> x = 721 : 7
=> x= 103
c. 8(x - 3) = 0
=> x-3=0:8
=> x-3=0
=> x=0+3
=> x=3
a. 4x : 17= 0
4x = 0 : 17
4x = 0
x = 0 : 4
x = 0
b. 7x - 8 = 713
7x = 713 + 8
7x = 721
x = 721 : 7
x = 103
c . 8 ( x - 3 ) = 0
x - 3 = 0 : 8
x - 3 = 0
x = 0 + 3
x = 3
a) 4x : 17 = 0
b) 7x - 8 = 713
c) 8( x - 3 ) = 0
a) 4x:17=0
4x=0x17
4x=0
x=0:4
x=0
b)7x-8=713
7x=213+8
7x=221
x=221:7
x=221/7
c)8(x-3)=0
8x - 8x3 = 0
8x -24=0
8x=0+24
8x=24
x=24:8
x=3
Bài 2: Tìm x:
a) 156 – (x+ 61) = 82 b) (x-35) -120 = 0 c) 124 + (118 – x) = 217 d) 7x – 8 = 713 e) x- 36:18 = 12 f) (x- 36):18 = 12 g) (x-47) -115 = 0 |
|
|
Bài 3: Tính nhanh
a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27 c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66 e) 12.35 + 35.182 – 35.94 | f) 48.19 + 48.115 + 134.52 g) 27.121 – 87.27 + 73.34 h) 125.98 – 125.46 – 52.25 i) 136.23 + 136.17 – 40.36 j) 17.93 + 116.83 + 17.23 | k) 35.23 + 35.41 + 64.65 l) 29.87 – 29.23 + 64.71 m) 19.27 + 47.81 + 19.20
|
Bài 4: Tính giá trị của biểu thức sau:
a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9) d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123) g) 23 + (-13) h) (-23) + 13 i) 26 + (-6) | j) 80 + (-220) k) (-23) + (-13) l) (-26) + (-6) | m) 12 – 34 n) -23 – 47 o) 31 – (-23) p) -9 – (-5) q) 6 – (8 – 17) r) 19 + (23 – 33) s) (-12 – 44) + (-3) t) 4 – (-15) u) -29 – 23 | v) 99 – [109 + (-9)] w) (-75) + 50 x) (-75) + (-50) y) (-23) + 13 + ( - 17) + 57 z) 14 + 6 + (-9) + (-14)
|
a: =>x+61=74
hay x=13
b: =>x-35=120
hay x=155
d: =>7x=721
hay x=103
Tìm x a, 4x : 17 = 0 b, 7x - 8 = 713 c, 8(x - 3) = 0 d, 0 : x = 0
a) \(4x:17=0\)
\(4x=0\)
\(x=0\)
vay \(x=0\)
b) \(7x-8=713\)
\(7x=713+8\)
\(7x=721\)
\(x=103\)
vay \(x=103\)
c) \(8\left(x-3\right)=0\)
\(8x-24=0\)
\(8x=24\)
\(x=3\)
vay \(x=3\)
d) \(0:x=0\)
\(\Rightarrow x\in R\) va \(x\ne0\)
vay \(x\in R\)va \(x\ne0\)
a, 4x : 17 = 0
=>4x = 0
x = 0 : 4
x = 0
Vậy x = 0 .
b, 7x - 8 = 713
7x = 713 + 8
7x = 721
x = 721 : 7
x = 103
Vậy x = 103 .
c, 8( x - 3 ) = 0
=> x - 3 = 0
x = 0 + 3
x = 3
Vậy x = 3 .
d, 0 : x = 0
=> x là các số tự nhiên khác 0
=> X ∈ N*
Chúc học tốt !
tìm x
4x:17=0
7x-8=713
8(x-3)=0
4x:17=0
4x=0.17
4x=0
x=0:4
x=0
7x-8=713
7x=713+8
7x=721
x=721:7
x=103
8(x-3)=0
x-3=0:8
x-3=0
x=0+3
x=3
tìm số tự nhiên x biết 7x - 8 = 713 ; 8(x- 3)= 0 ; 4x : 17 = 0
7x-8=713 8(x-3)=0 4x:17=0
7x=713+8 =>x-3=0 =>4x=0
7x=721 =.x=3 =>x=0
x=721:7
x=103
7x-8=713 8(x-3)=0 4x÷17=0
7x=713+8 x-3=0÷8 4x=17×0
7x=721 x-3=0 4x=0
x=721÷7 x=3+0 ; x=0÷4
x=103 x=3 x=0
Tìm x:
4x:17=0;
7x-8=713;
8(x-3)=0
0
.4x : 17 = 0
<=> 4x = 17
<=> x = 17/4 = 4,25
7x - 8 = 713
<=> 7x = 713 + 8
<=> x = 103
8 ( x - 3 ) = 0
<=> 8x - 24 = 0
<=> 8x = 24
<=> x = 4
.
.
.
.
4x:17=0 7x-8=713 8(x-3)=0
4x=0.17=0 7x=713+8=721 x-3=0:8=0
x=0:4=0 x=721:7=103 x=0+3=3
Vậy x=0 Vậy x=103 Vậy x=3