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a) 219 – 7(x + 1) =100
7(x+1) = 219 -100
7(x+1) = 119
x + 1 = 119:7
x + 1 = 17
x = 17-1
x = 16
b) (3x – 6).3 = 34
3x – 6 = 34 : 3
3x – 6 = 33
3x = 27 + 6
3x = 33
x = 11
a ) 219 - 7( x + 1 ) = 100
7 ( x + 1 ) = 219 - 100
7 ( x + 1 ) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
b ) ( 3x - 6 ) . 3 = 34
( 3 x - 6 ) . 3 = 81
3x - 6 = 81 : 3
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
a)
\(219-7\left(x+1\right)=100\)
\(\Rightarrow7\left(x+1\right)=119\)
\(\Rightarrow x+1=17\)
=> x = 16
Vậy x = 16
b)
\(\left(3x-6\right)3=3^4\)
\(\Rightarrow\left(x-2\right)3^2=3^4\)
=> x - 2 = 9
=> x = 7
Vậy x = 7
a. 219 - 7(x+1) = 100
7(x+1)=119
x+1=119:7
x+1=17
x=16
Vậy x=16
b. (3x - 6) . 3 = 34
3x-6=34:3
3x-6=33
3x=33
x=11
Vậy x=11
a) \(219-7\left(x+1\right)=100\)
\(\Leftrightarrow219-7x-7=100\)
\(\Leftrightarrow-7x=100-219+7=-112\)
\(\Leftrightarrow x=16\)
b) \(\left(3x-6\right)\cdot3=3^4\)
\(\Leftrightarrow\left(x-2\right)\cdot3^2=3^4\)
\(\Leftrightarrow x-2=3^2\)
\(\Leftrightarrow x=9+2=11\)
a,219-7(x+1)=100
7(x+1)=219-100
7(x+1)=119
x+1= 119:7
x+1= 17
x= 17-1
x=16
Vậy x=16
b,123-5.(x+40)=38
5.(x+40)=123-38
5.(x+40)=85
x+40= 85:5
x+40=17
x= 17-40
x=-23
Vậy x=-23
c,(3x-6).3=34
3x-6 =34:3
3x-6 =33
3x-6 =27
3x =27+6
3x =33
x =33:3
x =11
Vậy x=11
d, 42.x=39.42-37.42
42.x=1638-1554
42.x=84
x =84:42
x =2
Vậy x=2
Nhớ nhé, học giỏi ^^
219 - 7(x+1)=100 (3x-6).3=34
=> 7(x+1)=219-100 => 3x-6=34:3
=> 7(x+1)=119 => 3x-6=32=9
=> x+1=119:7 => 3x=9+6
=> x+1=17 => 3x=15
=> x=17-1 => x=15:3
=> x=16 => x=5
Vậy x=16 Vậy x=5
14 chia hêt cho 2x+3
=>2x+3 thuộc Ư (14)
=>Ư (14)={1;2;7;14}
ta có
2x+3 | 1 | 2 | 3 | 14 |
x | X | X | 0 | X |
vậy x=0
219-7(x+1)=100
7(x+1)=219-100
7(x+1)=119
x+1 =119:7
x+1 =17
x =17-1
x =16
a)
204-84:12
=204-7
=197
b)
15.23+4.32-5.7
=15.8+4.9-5.7
=120+36-35
=156-35
=121
c)
56:53+23.22
=56-3+23+2
=53+25
=125+32
=157
d)
164.53+47.164
=(164.(53+47)
=164.100
=16400
tìm x:
219-7(x+1)=100
=>7(x+1)=219-100
=>7(x+1)=119
=>x+1=119:7
=>x+1=17
=>x=17-1
=>x=16
(3x-6).3=34
=>(3x-6).3=81
=>3x-6=81:3
=>3x-6=27
=>3x=27+6
=>3x=33
=>x=33:3
=>x=11
a) 219 - 7(x + 1 ) = 100 b) ( 3x - 6 ) . 3 = 34
7(x + 1 ) = 219 - 100 ( 3x - 6 ) . 3 = 81
7(x + 1 ) = 119 3x - 6 = 81 : 3
x + 1 = 119 : 7 3x - 6 = 27
x + 1 = 17 3x = 27 + 6
x = 17 - 1 = 16 3x = 33
x = 33 : 3 = 11
a)219 - 7(x + 1)= 100
<=> 7(x+1) = 219 - 100
<=> 7 (x + 1) = 119
<=> x+1=119:7
<=> x+1=17
=>x=16
vậy ...
b) (3x - 6).3=34
<=> 3x - 6 =34:3
<=> 3x-6=33=27
<=> 3x=27+6
<=>3x=33
=>x=11
vậy...
a) 7[x+1]=219-100
7[x+1]=119
[x+1]=119:7
[x+1]=17
+,x+1=17 =>x=17-1=16
+,x+1=(-17) =>x=(-17)-1=-18
Vậy x=16;x=-18
b) [3x-6].3= 34
[3x-6] = 33=27
+, 3x-6=27=>3x=27+6
3x=33
x=33:3
x=11
+, 3x-6=(-27)=>3x=(-27)+6
3x=(-21)
x=(-21):3
x=-7
Vậy x=11;x=(-7)