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\(2^4.x-3^2.x=145-225:51\)
\(16x-9x=145-\frac{75}{17}\)
\(7x=\frac{2390}{17}\)
\(x=\frac{2390}{119}\)
tk mình nhoa bạn
Ta có:
24.x-32.x=145-225:51
x(24-32)=145-225:51
Sai đề(225:51ko chia dc)
2^4 .x - 3^2 .x = 145 - 255 : 51
16.x - 9.x = 145 - 5
16.x - 9.x = 140
(16 - 9).x = 140
7x = 140
x = 140 : 7
x = 20
580:(x-24)=329-150:2
=> 580:(x-24)=329-75
=> 580:(x-24)=254
=>x-24= 580:254
=> x = 290/127 + 24
=> x = 3338/127
+) 24 * x -32 * x = 145-225:51
=> x.(24 -32) = 145-225:51
=> x.7= 145-225:51
=> x.7= 2390/17
=> x= 2390/119
+) 5x + 1 = 625
=> 5x + 1 = 54
=> x+1 = 4
=> x = 3
(4x-12)(x3+64)=0
=> [x3+64=0=>x=4x-12=0=>4x=12=>x=3 olm bị lỗi nên em đừng có viết cách ra 1 quãng như kia nhé !
vậy x thuộc {3;4}
(3x-12)(x2-4)=0
=>[x2-4=0=>x2=4=>x=2 hoặc x=-23x-12=0=>3x=12=>x=4
vậy x thuộc {4;2;-2}
(x+3)3:3-1=-10
(x+3)3:3=-9
(x+3)3=-9.3
=>(x+3)3=-27
=>x+3=-3
=>x=-6
(3x-1)3-2=-66
(3x-1)3=-64
(3x-1)3=-43
=>3x-1=-4
=>3x=-3
=>x=-1
\(\left(4x-12\right)\left(x^3+64\right)=0\)
\(\Leftrightarrow4x-12=0\)
\(\Leftrightarrow4x=0+12\)
\(\Leftrightarrow4x=12\)
\(\Leftrightarrow x=12\div4\)
\(\Leftrightarrow x=3\)
\(\Leftrightarrow x^3+64=0\)
\(\Leftrightarrow x^3=0=64\)
\(\Leftrightarrow x^3=\left(-64\right)\)
\(\Leftrightarrow x^3=\left(-4\right)^3\)
\(\Leftrightarrow x=\left(-4\right)\)
\(\Rightarrow x\in\left\{-4;3\right\}\)
\(\Leftrightarrow\left(3x-12\right)\left(x^2-4\right)=0\)
\(\Leftrightarrow3x-12=0\)
\(\Leftrightarrow3x=0+12\)
\(\Leftrightarrow3x=12\)
\(\Leftrightarrow x=12\div3\)
\(x=4\)
\(\Leftrightarrow x^2-4=0\)
\(\Leftrightarrow x^2=0+4\)
\(\Leftrightarrow x^2=4\)
\(\Leftrightarrow x^2=2^2=\left(-2\right)^2\)
\(\Rightarrow x\in\left\{2;-2\right\}\)
\(\Rightarrow x\in\left\{-2;2;4\right\}\)
Các câu khác tương tự nhé !
Answer:
Bài 3:
\(334-\left(-75\right)+[\left(-175\right)-34]\)
\(=334+75-175-34\)
\(=\left(334-34\right)+\left(75-175\right)\)
\(=300+\left(-100\right)\)
\(=200\)
\(68-\left(-45\right)-[368-\left(-145\right)]\)
\(=68+45-[368+145]\)
\(=\left(68-368\right)+\left(45-145\right)\)
\(=\left(-300\right)+\left(-100\right)\)
\(=-400\)
Bài 4:
\(-17-\left(x-5\right)=-52\)
\(\Rightarrow x-5=-17-\left(-52\right)\)
\(\Rightarrow x-5=35\)
\(\Rightarrow x=40\)
\(3\left(7-x\right)+\left(-12\right)=-75\)
\(\Rightarrow3\left(7-x\right)=-75-\left(-12\right)\)
\(\Rightarrow3\left(7-x\right)=-63\)
\(\Rightarrow7-x=-21\)
\(\Rightarrow x=28\)
a,(-12).x= 60-12
(-12).x=48
x=48:(-12)
x = -4
b,(-5).x + 5 = -24+6
(-5).x + 5 = 30
(-5).x = 30-5
(-5).x = 25
x = 25 : (-5)
x = -5
c,
`12^4 .x-3.x=145-225:51`
`=>20736x-3x=145-75/17`
`=>20733x=2390/17`
`=>x=2390/17:20733`
`=>x=2390/352461`
24x-3x=145-225:51(sửa đề)
=> 13x=145-75/17
=> 13x=2390/17
=> x=2390/221