1022 x 5 x 70 x 5 x 1 = ?
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1) \(2^3\times x-5^2\times x=2\times\left(5^2+2^2\right)-33\)
\(x\times\left(2^3-5^2\right)=2\times\left(25+4\right)-33\)
\(x\times\left(8-25\right)=2\times29-33\)
\(x\times-17=25\)
\(x=-\dfrac{25}{17}\)
2) \(15\div\left(x+2\right)=\left(3^3+3\right)\div1\)
\(15\div\left(x+2\right)=\left(27+3\right)\div1\)
\(15\div\left(x+2\right)=30\div1\)
\(15\div\left(x+2\right)=30\)
\(x+2=\dfrac{1}{2}\)
\(x=-\dfrac{3}{2}\)
3) \(20\div\left(x+1\right)=\left(5^2+1\right)\div13\)
\(20\div\left(x+1\right)=\left(25+1\right)\div13\)
\(20\div\left(x+1\right)=26\div13\)
\(20\div\left(x+1\right)=2\)
\(x+1=20\div2\)
\(x+1=10\)
\(x=9\)
4) \(320\div\left(x-1\right)=\left(5^3-5^2\right)\div4+15\)
\(320\div\left(x-1\right)=\left(125-25\right)\div4+15\)
\(320\div\left(x-1\right)=100\div4+15\)
\(320\div\left(x-1\right)=25+15\)
\(320\div\left(x-1\right)=40\)
\(x-1=8\)
\(x=9\)
5) \(240\div\left(x-5\right)=2^2\times5^2-20\)
\(240\div\left(x-5\right)=4\times25-20\)
\(240\div\left(x-5\right)=100-20\)
\(240\div\left(x-5\right)=80\)
\(x-5=30\)
\(x=35\)
6) \(70\div\left(x-3\right)=\left(3^4-1\right)\div4-10\)
\(70\div\left(x-3\right)=\left(81-1\right)\div4-10\)
\(70\div\left(x-3\right)=80\div4-10\)
\(70\div\left(x-3\right)=20-10\)
\(70\div\left(x-3\right)=10\)
\(x-3=7\)
\(x=10\)
1) 5 ( x + 7 ) - 10 = 50 => 5 ( x + 7 ) = 60
=> x + 7 =12
=> x = 12 - 7
=> x = 5
2) 42 : x - 5 = 1
=> 42 : x = 6
=> x = 7
3) ( x-1 ) ( x- 4 ) = 5
=> x = - 0,1925.....
4) 7x + 8x - 5x = 70
=> 10x = 70
=> x = 7
5) 4x + 9x - x = 60
=> 12x = 60
=> x = 5
*)5(x+7)-10=50
5(x+7)=60
x+7=12
x=5
*)42:x-5=1
42:x=6
x=7
*)7x+8-5x=70
x(7+8-5)=70
10x=70
x=7
*)4x+9x-x=60
x(4+9-1)=60
12x=60
x=5
a) TH1: 2x - 1 > 0 => x > 1 nên ta có :
2x - 1 = x - 5
=> 2x - x = 1 - 5
=>x = -4 ( không thỏa mãn vì x phải > 1 )
TH2 : 2x - 1 < 0 = - ( 2x - 1 ) => x < 1 nên ta có :
- 2x + 1 = x - 5
=> - 2x - x = -1 - 5
=> -3 x = - 6
=> x = 2 ( không thỏa mãn )
Vậy phương trình trên vô nghiệm
A) X = 70,5 - ( 89,075 : 3,5 )
X = 70,5 - 25,45
X = 40,05
B) X = ( 67,8 : 1,5 ) + 20,5
X = 45,2 + 20,5
X = 65,7
a)13-2(x+1)=7
2.(x+1)=13-7
2.(x+1)=6
x+1=6/2
x+1=3
x=3-1
x=2
a, 13 - 2 ( x + 1 ) = 7
2 .( x + 1 ) = 13 - 7
2 .( x + 1 ) = 6
x + 1 = 6 : 2
x + 1 = 3
x = 3 - 1
x = 4
1022 * 5 * 70 * 5 * 1 = 178 500
1788500