Những câu hỏi liên quan
tìm x:
a) (2x+1)^2-4(x+2)^2=9
b)3(x-1)^2-3x(x-5)=21
c)(x+3)^2-(x-4)(x+8)=1
d)3(x+2)^2+(2x-1)^2=7(x+3)(x-3)=36
e)(x-1)(x^2+x+1)-x(x+2)(x-2)=5
f)(x-1)^3 -(x+3)(x^2-3x+9)+3(x^3-4)=2
1.Tìm x:
a) (2x+1)^2-4(x+2)^2=9
b) 3(x-1)^2-3x(x-5)=21
c) (x+3)^2-(x-4)(x+8)=1
d) 3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
e) (x-1)(x^2+x+1)-x(x+2)(x-2)=5
f) (x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
tìm x:
a) (2x+1)^2-4(x+2)^2=9
b)3(x-1)^2-3x(x-5)=21
c)(x+3)^2-(x-4)(x+8)=1
d)3(x+2)^2+(2x-1)^2=7(x+3)(x-3)=36
e)(x-1)(x^2+x+1)-x(x+2)(x-2)=5
f)(x-1)^3 -(x+3)(x^2-3x+9)+3(x^3-4)=2
thực hiện phép tính
A= 26/11x 7/4 x 22/21 x 9
B= -10/21 x [ 9/15 + (3/5)2 ]
C= ( 2 - 1/2 - 1/3) x ( 1- 1/4 - 1/7)
a .(18 – 9 x 2) x (2 + 4 + 6 + 8 + 10)b.(7 x 8 – 56 ) : (2 + 4 + 6 + 8 + 112)c. (2 + 125 + 6 + 145 + 112) x (42 – 6 x 7)d.(12 x 6 – 12 x 4 – 12 x 2) x ( 347 + 125)e(a x 7 + a x 8 – a x 15) : (1 + 2 + 3 + ........ + 10)f.58 – 58 x (6 + 54 – 60)g.32 + 63 x a x ( a x 1 – a : 1) + 32 x 8 + 32h.(1 + 2 + 3 + 4 + .... + 9) x (21 x 5 – 21 – 4 x21)i.(9 x 7 + 8 x 9 – 15 x 9) : (1 + 3 + 5 + 7 + ........+ 17 + 19)k.(2 + 4 + 6 + 8 + ... + 20) x (56 x 3 – 72 : 9 x 21)
Đọc tiếp
a .(18 – 9 x 2) x (2 + 4 + 6 + 8 + 10)
b.(7 x 8 – 56 ) : (2 + 4 + 6 + 8 + 112)
c. (2 + 125 + 6 + 145 + 112) x (42 – 6 x 7)
d.(12 x 6 – 12 x 4 – 12 x 2) x ( 347 + 125)
e(a x 7 + a x 8 – a x 15) : (1 + 2 + 3 + ........ + 10)
f.58 – 58 x (6 + 54 – 60)
g.32 + 63 x a x ( a x 1 – a : 1) + 32 x 8 + 32
h.(1 + 2 + 3 + 4 + .... + 9) x (21 x 5 – 21 – 4 x21)
i.(9 x 7 + 8 x 9 – 15 x 9) : (1 + 3 + 5 + 7 + ........+ 17 + 19)
k.(2 + 4 + 6 + 8 + ... + 20) x (56 x 3 – 72 : 9 x 21)
1.(18 - 18) x (2 + 8) + ( 4 + 6) + 10 = 30
có rút gọn phân số 35/6 về phân số đc ko ? Nếu có thì mn rút gọn cho mik nhé !
Ai xong tr tui k cho
Adfrac{sqrt{x}+2}{sqrt{x}-2}-dfrac{3}{sqrt{x}+2}+dfrac{12}{x-4}Bdfrac{sqrt{x}}{sqrt{x}-3}-dfrac{sqrt{x}-21}{9-x}dfrac{1}{sqrt{x}+3}Cdfrac{sqrt{x}}{sqrt{x}+3}+dfrac{2sqrt{x}}{sqrt{x}-3}-dfrac{3x+9}{x-9}Ddfrac{1}{sqrt{x}+3}-dfrac{sqrt{x}}{3-sqrt{x}}+dfrac{2sqrt{x}+12}{x-9}Ndfrac{sqrt{x}}{sqrt{x}-1}+dfrac{2sqrt{x}-1}{sqrt{x}+1}-dfrac{6}{x-1}Mdfrac{3}{sqrt{x}-3}+dfrac{2}{sqrt{x}+3}+dfrac{x-5sqrt{x}-3}{x-9}
Đọc tiếp
\(A=\dfrac{\sqrt{x}+2}{\sqrt{x}-2}-\dfrac{3}{\sqrt{x}+2}+\dfrac{12}{x-4}\)
\(B=\dfrac{\sqrt{x}}{\sqrt{x}-3}-\dfrac{\sqrt{x}-21}{9-x}\dfrac{1}{\sqrt{x}+3}\)
\(C=\dfrac{\sqrt{x}}{\sqrt{x}+3}+\dfrac{2\sqrt{x}}{\sqrt{x}-3}-\dfrac{3x+9}{x-9}\)
\(D=\dfrac{1}{\sqrt{x}+3}-\dfrac{\sqrt{x}}{3-\sqrt{x}}+\dfrac{2\sqrt{x}+12}{x-9}\)
\(N=\dfrac{\sqrt{x}}{\sqrt{x}-1}+\dfrac{2\sqrt{x}-1}{\sqrt{x}+1}-\dfrac{6}{x-1}\)
\(M=\dfrac{3}{\sqrt{x}-3}+\dfrac{2}{\sqrt{x}+3}+\dfrac{x-5\sqrt{x}-3}{x-9}\)
a: Ta có: \(A=\dfrac{\sqrt{x}+2}{\sqrt{x}-2}-\dfrac{3}{\sqrt{x}+2}+\dfrac{12}{x-4}\)
\(=\dfrac{x+4\sqrt{x}+4-3\sqrt{x}+6+12}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)
\(=\dfrac{x+\sqrt{x}+22}{x-4}\)
d: Ta có: \(D=\dfrac{1}{\sqrt{x}+3}-\dfrac{\sqrt{x}}{3-\sqrt{x}}+\dfrac{2\sqrt{x}-12}{x-9}\)
\(=\dfrac{\sqrt{x}-3+x+3\sqrt{x}+2\sqrt{x}-12}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-3\right)}\)
\(=\dfrac{x+6\sqrt{x}-15}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-3\right)}\)
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A=\(A=\dfrac{\sqrt{x}+2}{\sqrt{x}-2}-\dfrac{3}{\sqrt{x}+2}+\dfrac{12}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}A=\dfrac{\sqrt{x}+2.\left(\sqrt{x}+2\right)-3.\left(\sqrt{x}-2\right)+12}{\left(\sqrt{x}-2\right).\left(\sqrt{x}+2\right)}A=\dfrac{\sqrt{x}+2\sqrt{x}+4-3\sqrt{x}+6+12}{\left(\sqrt{x}-2\right).\left(\sqrt{x}+2\right)}A=\dfrac{22}{\left(\sqrt{x}-2\right).\left(\sqrt{x}+2\right)}\)
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Tìm x, biết:
a) \(\left(3\dfrac{1}{2}-2.x\right).3\dfrac{1}{3}=7\dfrac{1}{3}\)
b) \(\dfrac{4}{9}.x=\dfrac{9}{8}-0,125\)
c) \(\dfrac{-X}{21}=\dfrac{20}{7}\)
a, \(\left(\dfrac{7}{2}-2x\right).\dfrac{10}{3}=\dfrac{22}{3}\Leftrightarrow\dfrac{7}{2}-2x=\dfrac{22}{10}=\dfrac{11}{5}\)
\(\Leftrightarrow2x=\dfrac{13}{10}\Leftrightarrow x=\dfrac{13}{20}\)
b, \(\dfrac{4x}{9}=\dfrac{9}{8}-\dfrac{125}{1000}=1\Leftrightarrow x=\dfrac{9}{4}\)
c, \(-\dfrac{x}{21}=\dfrac{60}{21}\Rightarrow x=-60\)
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Tìm x, biết :
a, ( x +2 ) ( x^2 - 2x + 4 ) - x( x + 3 ) ( x - 3) = 26
b, ( x - 3 ) ( x^2 + 3x + 9 ) - x( x - 4 ) ( x + 4 ) = 21
c, ( 2x -1 ) ( 4x^2 + 2x + 1 ) - 4x(2x^2 - 3 ) = 23
a/\(\left(x+2\right)\left(x^2-2x+4\right)-x\left(x+3\right)\left(x-3\right)=26\)
↔ \(x^3+2^3\)\(-x\left(x^2-3^2\right)\)= 26
↔\(x^3+8-x^3+9x=26\)
↔\(9x=18\leftrightarrow x=2\)
Vậy x=2
b/\(\left(x-3\right)\left(x^2+3x+9\right)-x\left(x-4\right)\left(x+4\right)=21\)
\(\Leftrightarrow x^3-3^3-x\left(x^2-4^2\right)=21\)
\(\Leftrightarrow x^3-9-x^3+16x=21\)
\(\Leftrightarrow16x=30\)
\(\Leftrightarrow x=\frac{15}{8}\)
Vậy \(x=\frac{15}{8}\)
c/\(\left(2x-1\right)\left(4x^2+2x+1\right)-4x\left(2x^2-3\right)=23\)
↔\(\left(2x\right)^3-1^3-4x\left(2x^2-3\right)=23\)
↔\(8x^3-1-8x^3+12x=23\)
↔\(12x=24\leftrightarrow x=2\)
Vậy x=2
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a, (x + 2)(x2 - 2x + 4 ) - x(x + 3)(x - 3) = 26
<=> x3 + 8 - x(x2 - 9) = 26
<=> x3 + 8 - x3 + 9x = 26
<=> 9x - 18 = 0
<=> 9x = 18
<=> x = 2
b, (x - 3)(x2 + 3x + 9) - x(x - 4)(x + 4) = 21
<=> x3 - 27 - x(x2 - 16) = 21
<=> x3 - 27 - x3 + 16x = 21
<=> 16x - 48 = 0
<=> 16x = 48
<=> x = 3
c, (2x - 1)(4x2 + 2x + 1) - 4x(2x2 - 3) = 23
<=> 8x3 - 1 - 8x3 + 12x = 23
<=> 12x - 24 = 0
<=> 12x = 24
<=> x = 2
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\(\left(x+2\right)\left(x^2-2x+4\right)-x\left(x+3\right)\left(x-3\right)=26\)
\(< =>x^3-2x^2+4x+2x^2-4x+8-x\left(x^2-9\right)-26=0\)
\(< =>x^3+8-x^3+9x-26=0\)
\(< =>9x-18=0< =>x=2\)
Xem thêm câu trả lời
Tìm x biết:
a) 6* 8^x-1 + 8^x+1 = 6* 8^19 + 8^21
b) 4* 3^x-1 + 2* 3^x+2 = 4* 3^6 +2* 3^9
a) \(6.8^{x-1}+8^{x+1}=6.8^{19}+8^{21}\)
\(\Rightarrow x-1+x+1=19+21\)
\(=2x=40\)
\(\Rightarrow x=20\)
b) \(4.3^{x-1}+2.3^{x+2}=4.3^6+2.3^9\)
\(\Rightarrow x-1+x+2=6+9\)
\(\Rightarrow2x+1=15\)
\(\Rightarrow2x=14\)
\(\Rightarrow x=7\)
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