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Đề kia bị dính vào nhau, các bạn nhìn ảnh cho rõ nhé
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Ta có : x(x - 1) - (x - 1)2 = 0
=> x2 - x - (x2 - 1) = 0
=> x2 - x - x2 +1 = 0
=> -x +1 = 0
=> -x = -1
=> x =1
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a) 6x + x = 511 : 59 + 31
6x + x = 52 + 31
7x = 25 + 3
7x = 28
x = 28 : 7
x = 4
b) 7x - x = 521 : 59 + 3 . 22 - 70
6x = 512 + 3 . 4 - 1
6x = 244140625 + 12 - 1
6x = 244140636
x = 244140636 : 6
x = 40690106
a)6x +x = 511 :59 +31
(6+1)x=52 +3
7x =25 +3=28
x = 28 :7
x=4
Vậy x=4
b) 7x-x = 521 : 59 +3 . 22 - 7
(7-1)x = 512 +3.4-1
6x= 244140625 + 12 - 1
6x = 244140637-1=244140636
x=244140636:6
x=40690106
Vậy x= 40690106
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1) (X-6)x(2x - 6)=0
=> X - 6 = 0 => x = 0 + 6 = 6
=> 2x - 6 = 0 => 2x = 6 => X = 6 : 2 = 3
Vẫy x{6; 3}
2) 100:(x-7)=1
x-7 = 100:1
x-7 = 100
x = 100 + 7
x = 107
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1a)1+2+3+...+x=0
\(\frac{x.\left(x+1\right)}{2}\)=0
x.(x+1) =0:2
x.(x+1) =0
x.(x+1) =0.1
vây x=0
tich dung cho minh nha
\(\left(x-3\right).\left(x^2+1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x^2+1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=\pm1\end{cases}}}\)
\(\Rightarrow x\in\left\{\pm1;3\right\}\)
học tốt