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a)219-7(x+1)=100
7(x+1)=219-100
x+1=119/7
x+1=17
x=17-1
x=16
b)(3x-6)*3=64
3x-6=64/3
3x=64/3+6
3x=82/3
x=82/3:3
x=82/9
a) 219-7(x+1)=100
219-7x-7=100
-7x=100-219+7
-7x=-112
x=16
b) (3x-6).3=64
3x-6=64/3
3x=82/3
x=82/9
a) x – 32 : 16 = 48 ó x – 2 = 48 ó x = 48 + 2 ó x = 50
b) 88 – 3.(7+x) = 64 ó 3.(7+x) = 88 – 64 ó 7 + x = 24:3 ó x = 8 – 7 ó x = 1
c) (5+4x) : 3 – 121 : 11 = 4 ó (5+4x) : 3 – 11 = 4 ó (5+4x) : 3 = 4 + 11 ó 5+4x = 15.3 ó 4x = 45 – 5 ó 4x = 40 ó x = 10
d) 15 – 2(3x+1) = 11.13 – 130 ó 15 – 2(3x+1) = 143 – 130 ó 15 – 2(3x+1) = 13
ó 2(3x+1) = 15 – 13 ó 3x + 1 = 2:2 ó 3x = 1 – 1 ó 3x = 0 ó x = 0
câu trả lời ngắn gon nhất là .................................................................................................................................................................................................................................................................................................................. tự làm nhé bạn
a) x = 4
b) x = 5
c) x = 2
d) x = 2
e, x = 1
f, x = 0 hoặc x = 1
3x + 2 ⁝ 2x + 1
=> 2( 3x + 2 ) ⁝ 2x + 1
=> 6x + 4 ⁝ 2x + 1
=> 3( 2x + 1 ) + 1 ⁝ 2x + 1
Mà 3( 2x + 1 ) ⁝ 2x + 1
=> 1 ⁝ 2x + 1
=> 2x + 1 = 1
=> 2x = 0
=> x = 0 ( thỏa mãn )
\(3x+2⋮2x+1\)
\(\Rightarrow2\left(3x+2\right)⋮2x+1\)
\(\Rightarrow6x+4⋮2x+1\)
\(\Rightarrow6x+3+1⋮2x+1\)
\(\Rightarrow3\left(2x+1\right)+1⋮\left(2x+1\right)\)
Vậy 2x+1 thuộc Ư(1)=1
\(2x+1=1\Rightarrow2x=0\Rightarrow x=0\)
b,Ta có 3x+7:x-2=>3x-6+13:x-2=>3(x-2)+13:x-2=>13:x-2
Vì \(x\in N\Rightarrow x-2\in N\Rightarrow x-2\inƯ\left(13\right)=\left(1,13\right)\Rightarrow x\in\left(3,15\right)\)
\(2^{x+2}=32\Rightarrow2^{x+2}=2^5\Rightarrow x+2=5\Rightarrow x=3\)
\(\left(3x+1\right)^3=64\Rightarrow\left(3x+1\right)^3=4^3\)
\(\Rightarrow3x+1=4\Rightarrow3x=3\Rightarrow x=1\)
3x-1=8
3x=8+1
3x=9
x=9:3=3
\(\left(3x-1\right)^2=64\)
\(\Rightarrow\left(3x-1\right)^2=8^2\)
\(\Rightarrow\left(3x-1\right)=8\)
\(\Rightarrow3x=9+1\)
\(\Rightarrow3x=9\)
\(\Rightarrow x=3\)