Tìm x, biết:
a) \(\left(3x-1\right)^2-\left(2x+3\right)^2=0\)
b)\(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)=81\)
Những câu hỏi liên quan
a) (12x-5)(4x-1)+(3x-7)(1-16x)=81
b) (2x-3)(2x+3)-(4x+1).x=1
c) \(3x^2-\left(x+2\right)\left(3x-1\right)=-7\)
a/ \(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)=81\)
<=> \(48x^2-12x-20x+5+3x-48x^2-7+112x=81\)
<=> \(83x-2=81\)
<=> \(83x=83\)
<=> \(x=1\)
b/ \(\left(2x-3\right)\left(2x+3\right)-\left(4x+1\right)x=1\)
<=> \(4x^2-9-4x^2-x=1\)
<=> \(-\left(9+x\right)=1\)
<=> \(9+x=-1\)
<=> \(x=-10\)
c/ \(3x^2-\left(x+2\right)\left(3x-1\right)=-7\)
<=> \(3x^2-\left(3x^2-x+6x-2\right)=-7\)
<=> \(3x^2-3x^2+x-6x+2=-7\)
<=> \(-5x+2=-7\)
<=> \(-5x=-9\)
<=> \(x=\frac{9}{5}\)
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Giải phương trình
a) \(\left(x+2\right)^2-2\left(x-3\right)=\left(x+1\right)^2\)
b)\(3x\left(5-2x\right)-4\left(x+2\right)=6\left(x-2\right)^2\)
c)\(\left(12x-5\right)\left(4x-1\right)-\left(3x-7\right)\left(1+16x\right)=0\)
d)\(\left(2x+7\right)^2=\left(x+3\right)^2\)
bài dễ cậu tự làm được mÀ
Tìm \(x\), biết :
\(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)=81\)
Ta có: \(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)=81\)
\(\Leftrightarrow48x^2-12x-20x+5+3x-48x^2-7+112x=81\)
\(\Leftrightarrow83x-2=81\)
\(\Leftrightarrow83x=81+2=83\)
\(\Leftrightarrow x=1\)
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(12x – 5)(4x – 1) + (3x – 7)(1 – 16x) = 81.
48x2 – 12x – 20x + 5 + 3x – 48x2 – 7 + 112x = 81.
83x – 2 = 81.
83x = 83.
x = 1.
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Ta co:(12x-5)(4x-1) +(3x-7)(1-16x)=81
⇔48x2-12x -20x +5 +3x-48x2 -7 ++112x=81
⇔83x-2=81
⇔83x=81 +2=83
⇔x = 1
Chuc ban hoc tot❓❗⛇
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giải pt:
a,\(\left(13-4x\right)\sqrt{2x-3}+\left(4x-3\right)\sqrt{5-2x}=2+8\sqrt{-4x^2+16x-15}\)
b,\(\left(9x-2\right)\sqrt{3x-1}+\left(10-9x\right)\sqrt{3-3x}-4\sqrt{-9x^2+12x-3}=4\)
c, \(\left(6x-5\right)\sqrt{x+1}-\left(6x+2\right)\sqrt{x-1}+4\sqrt{x^2-1}=4x-3\)
Tìm x biết:
\(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)=81\)
Mình đăng giùm chị mình thôi!
( 12x-5)( 4x-1)+ ( 3x-7)(1-16x)
=> 48x^2-48x^2-12x-20x+3x+112x+5-7=81
=> 83x-2=81
=> x=1
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(12x - 5)(4x - 1) + (3x - 7)(1 - 16x) = 81
48x2 - 12x - 20x + 5 + 3x - 48x2 - 7 + 112x = 81
83x - 2 = 81
83x = 81 + 2
83x = 83
x = 1
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Tìm số nguyên x
1/ 17x+3left(-16x-37right)2x+43-4x
2/ -2x-3left(x-17right)34-2left(-x+25right)
3/ left{-3x+2left[45-x-3left(3x+7right)-2xright]+4xright}55-103-57:left[-2left(2x-1right)^2-left(-9right)^0right]-106
4/ -2x+3left{12-2left[3x-left(20+2xright)-4xright]+1right}45
5/ 3x-32-5+1
6/ 15+4x 2x-145
7/ -3left(2x+5right)-16 -4left(3-2xright)
8/ -2x+15 3x-7 19-x
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Tìm số nguyên x
1/ \(17x+3\left(-16x-37\right)=2x+43-4x\)
2/ \(-2x-3\left(x-17\right)=34-2\left(-x+25\right)\)
3/ \(\left\{-3x+2\left[45-x-3\left(3x+7\right)-2x\right]+4x\right\}=55-103-57:\left[-2\left(2x-1\right)^2-\left(-9\right)^0\right]=-106\)
4/ \(-2x+3\left\{12-2\left[3x-\left(20+2x\right)-4x\right]+1\right\}=45\)
5/ \(3x-32>-5+1\)
6/ \(15+4x< 2x-145\)
7/ \(-3\left(2x+5\right)-16< -4\left(3-2x\right)\)
8/ \(-2x+15< 3x-7< 19-x\)
bài tập tết nâng cao phải ko
mk cũng có nhưng chưa làm dc
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Tìm x:a) 3xleft(3x-8right)-9x^2+80b)6x-15-xleft(5-2xright)0c) x^3-16x0d) 2x^2+3x-50e) 3x^2-xleft(3x-6right)36f) left(x+2right)^2-left(x-5right)left(x+1right)17g) left(x-4right)^2-xleft(x+6right)9h) 4xleft(x-1000right)-x+10000i) x^2-360j) x^2y-2+x+x^2-2y+xy0k) xleft(x+1right)-left(x-1right).left(2x-3right)0l) 3x^3-27x0
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Tìm x:
a) \(3x\left(3x-8\right)-9x^2+8=0\)
b)\(6x-15-x\left(5-2x\right)=0\)
c) \(x^3-16x=0\)
d) \(2x^2+3x-5=0\)
e) \(3x^2-x\left(3x-6\right)=36\)
f) \(\left(x+2\right)^2-\left(x-5\right)\left(x+1\right)=17\)
g) \(\left(x-4\right)^2-x\left(x+6\right)=9\)
h) \(4x\left(x-1000\right)-x+1000=0\)
i) \(x^2-36=0\)
j) \(x^2y-2+x+x^2-2y+xy=0\)
k) \(x\left(x+1\right)-\left(x-1\right).\left(2x-3\right)=0\)
l) \(3x^3-27x=0\)
Tìm x
\(\left(4x-1\right)^3+\left(3-4x\right)\left(9+12x+16x^2\right)=\left(8x-1\right)\left(8x+1\right)-\left(3x-5\right)\)
GIÚP MIK VS
1.Rút gọn
a,\(\left(3x-5\right)\left(9x^2+15x+25\right)\)
b,\(\left(2x+7\right)\left(x^2-14x+49\right)-2x\left(2x-1\right)\left(2x+1\right)\)
c,\(\left(4x-7\right)\left(16x^2+28x+49\right)\)\(\left(3x+1\right)\left(9x^2-3x+1\right)-9x\left(3x^2-1\right)\)
d,
a) \(\left(3x-5\right)\left(9x^2+15x+25\right)\)
\(=\left(3x\right)^3-5^3\)
\(=27x^3-125\)
b) \(\left(2x+7\right)\left(x^2-14x+49\right)-2x\left(2x-1\right)\left(2x+1\right)\)
\(=2x^3-28x^2+98x+7x^2-98x+343-2x\left(4x^2-1\right)\)
\(=2x^3-28x^2+7x^2+343-8x^3+2x\)
\(=-6x^3-21x^2+343+2x\)
c) \(\left(4x-7\right)\left(16x^2+28x+49\right)\left(3x+1\right)\left(9x^2-3x+1\right)-9x\left(3x^2-1\right)\)
\(=\left(64x^3-343\right)\left(3x+1\right)\left(9x^2-3x+1\right)-27x^3+9x\)
\(=\left(6x^3-343\right)\left(27x^3+1\right)-27x^3+9x\)
\(=1728x^6+64x^3-9261x^3-343-27x^3+9x\)
\(=1728x^6-9224x^3-343+9x\)
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