tìm x
a.3:x-10=-12
b.x:(-5)+10=-60
c.(2-x):(-4)-5=-11
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\(b)\)\(x\div\left(-5\right)+10=-60\)
\(x\div\left(-5\right)=-60-10\)
\(x\div\left(-5\right)=-70\)
\(x=-70\times\left(-5\right)\)
\(x=350\)
\(a)\)\(3\div x-10=-12\)
\(3\div x=-12+10\)
\(3\div x=-2\)
\(x=3\div-2\)
\(x=-\frac{3}{2}=-1,5\)
\(\text{a)}3:x-10=-12\)
\(3:x\) \(=\left(-12\right)+10=-2\)
\(x\) \(=3:\left(-2\right)=-1,5\)
\(\text{b)}\left(2-x\right):\left(-4\right)-5=11\)
\(\left(2-x\right):\left(-4\right)\) \(=11+5=16\)
\(\left(2-x\right)\) \(=16x\left(-4\right)=-64\)
\(x\) \(=2-\left(-64\right)=66\)
\(\text{c)}x:\left(-5\right)+10=-60\)
\(x:\left(-5\right)\) \(=\left(-60\right)-10=-70\)
\(x\) \(=\left(-70\right)x\left(-5\right)=350\)
\(\left(3-2x\right)^2=16\)
\(\left(3-2x\right)^2=\pm\left(4\right)^2\)
\(\text{Vậy 3-2x=4 hoặc }\) \(3-2x=-4\)
\(2x=3-4=-1\) \(2x=3-\left(-4\right)=7\)
\(x=\left(-1\right):2=-0,5\) \(x=7:2=3,5\)
\(\text{Câu b với c mik lỡ làm ngược lại rồi bạn thông cảm}\)
\(\text{Hok tốt!}\)
\(\text{@Kaito Kid}\)
\(a,\Leftrightarrow\left[{}\begin{matrix}x-8=0\\x^3+8=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=8\\x^3=-8\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=8\\x=-2\end{matrix}\right.\\ b,\Leftrightarrow4x-3-x-5=30-3x\\ \Leftrightarrow4x-x+3x=30+5+3\\ \Leftrightarrow6x=38\\ \Leftrightarrow x=\dfrac{19}{3}\)
9/11 x 10/13 + 9/13 x 12/11 - 7/11
= 9/13 x 10/11 + 9/13 x 12/11 - 7/11
= 9/13 x (10/11 + 12/11) - 7/11
= 9/13 x 22/11 - 7/11
= 9/13 x 2 - 7/11
= 18/13 - 7/11
= 198/143 - 91/143
= 107/143
\(\dfrac{9}{11}\times\dfrac{10}{13}+\dfrac{9}{13}\times\dfrac{12}{11}-\dfrac{7}{11}=\dfrac{9}{13}\times\dfrac{10}{11}+\dfrac{9}{13}\times\dfrac{12}{11}-\dfrac{7}{11}=\dfrac{9}{13}\times\left(\dfrac{10}{11}+\dfrac{12}{11}\right)-\dfrac{7}{11}=\dfrac{9}{13}\times2-\dfrac{7}{11}=\dfrac{18}{13}-\dfrac{7}{11}=\dfrac{107}{143}\)
(1+x)+(2+x)+(3+x)+(4+x)+(5+x)=10*5
(1+2+3+4+5)+ (x+x+x+x+x)=50
15+5*x=50
5*x=50-15
5*x=35
x=35:5=7
(1+x)+(2+x)+(3+x)+(4+x)+(5+x)=10*5
1+x+2+x+3+x+4+x+5+x=50
(1+2+3+4+5)+(x+x+x+x+x)=50
15+5x=50
5x=50-15
5x=35
x=35:5
x=7
câu a+b dùng quy tắc chuyển vế
c, 3.(1/2-x)-5.(x-1/10)=-7/4
=>(3.1/2-3x)-(5x-5.1/10)=-7/4
=>3/2-3x-5x+1/2=-7/4
=>(3/2+1/2)-(3x+5x)=-7/4
=> 2-8x=-7/4
=>8x=15/4
=>x=15/4:8
=>x=15/32
a) 2.(1/4 - 3x) = 1/5 - 4x
=> 1/2 - 6x = 1/5 -4x
=> -6x + 4x = 1/5 - 1/2
=> -2x = -3/10 = 3/20
b) 4.(1/3 - x) + 1/2 = 5/6 +x
=> 4/3 - 4x + 1/2 = 5/6 +x
=> -4x - x = 5/6 - 4/3 - 1/2
=> -5x = -1
=> x= 1/5
c) 3. (1/2 - x) -5. ( x - 1/10) = -7/4
=> 3/2 - 3x - 5x + 1/2 = -7/4
=> -3x - 5x = -7/4 - 3/2 - 1/2
=> -8x = -15/4
=> x = 15/32
Bài 1:
a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)
\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{6}{7}\)
b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)
\(\Rightarrow x=\dfrac{1}{6}\)
tìm x
a.3:x-10=-12
3:x = -12+10
3:x = -2
x = 3:(-2)
x = -3/2
b.x:(-5)+10=-60
x:(-5) =-60-10
x:(-5) = -70
x = -70 x (-5)
x = 350
bạn biết làm câu c ko