\(2^x:2^3=1\)
H24
Những câu hỏi liên quan
a, (3x+2)2 - (3x-2)2 =5x+38 b, 3(x-2)2 +9(x-1) =3(x2+x-3)
c, (x+3)3 -(x-3)2 -(x-3)2 =6x+18 d, (x-1)3-x(x+1)2=5x(2-x)-11(x+2)
e, (x+1)(x2-x+1)-2x=x(x-1)(x+1) f, (x-2)3+(3x-1)(3x+1)=(x+1)3
a: =>9x^2+12x+4-9x^2+12x-4=5x+38
=>24x=5x+38
=>19x=38
=>x=2
e: =>x^3+1-2x=x^3-x
=>-2x+1=-x
=>-x=-1
=>x=1
f: =>x^3-6x^2+12x-8+9x^2-1=x^3+3x^2+3x+1
=>12x-9=3x+1
=>9x=10
=>x=10/9
b: \(\Leftrightarrow3x^2-12x+12+9x-9=3x^2+3x-9\)
=>-3x+3=3x-9
=>-6x=-12
=>x=2
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a,1/3 .(x-2/5)=3/4 b, 7/3:(x-2/3)=4/5 c,1/3.(x-2/5)=4/5 d, 2/3.(x-1/2)-1/4.(x-2/5)=7/3 e,3/7 .(x-2/3)+1/2=5/4.(x-2) f,1/2.(x-3)+1/3.(x-4)+1/4.(x-5)=1/5 g,[2/3.(x-1/2)-4/5]:(x-1/3)=21/5 h, {x-[1/2.(x-3)+11/5]}:(x-1/2)=3/5 i,x.(x-2/5)-(x+2).x+11/4=4/3
a: =>x-2/5=3/4:1/3=3/4*3=9/4
=>x=9/4+2/5=45/20+8/20=53/20
b: =>x-2/3=7/3:4/5=7/3*5/4=35/12
=>x=35/12+2/3=43/12
c: 1/3(x-2/5)=4/5
=>x-2/5=4/5*3=12/5
=>x=12/5+2/5=14/5
d: =>2/3x-1/3-1/4x+1/10=7/3
=>5/12x-7/30=7/3
=>5/12x=7/3+7/30=77/30
=>x=77/30:5/12=154/25
e: \(\Leftrightarrow x\cdot\dfrac{3}{7}-\dfrac{2}{7}+\dfrac{1}{2}-\dfrac{5}{4}x+\dfrac{5}{2}=0\)
=>\(x\cdot\dfrac{-23}{28}=\dfrac{2}{7}-3=\dfrac{-19}{7}\)
=>x=19/7:23/28=76/23
f: =>1/2x-3/2+1/3x-4/3+1/4x-5/4=1/5
=>13/12x=1/5+3/2+4/3+5/4=257/60
=>x=257/65
i: =>x^2-2/5x-x^2-2x+11/4=4/3
=>-12/5x=4/3-11/4=-17/12
=>x=17/12:12/5=85/144
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Tìm x biết : 6(x+2)(x-3)-3(x-2)^2-3(x-1)(x+1)=1
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
(x-1)(x^2+x+1)+x(x+2)(2-x)=5
(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
Tìm x biết : 6(x+2)(x-3)-3(x-2)^2-3(x-1)(x+1)=1
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
(x-1)(x^2+x+1)+x(x+2)(2-x)=5
(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
Giải các phương trình sau:1) 2 1 5 x 2) 2 1 5 x x 3) 3 1 2 x x 4) 3 2 2 x x5) 2 1 5 x x 6) 3 2 x x7) 2 3 2 1 x x 8) 2 1 4 1 0 x x 29) 2 5 4 3 1 1 23 2 3 1x xx x x x 10) 1 7 3 23 3 9x x xx x x 11) 5 296 2 1 3 116 4 4x xx x x 12) 2 412 1 2 1 2 1 2 1x xx x x x 13) 2 1 2 22 2xx x x x 14) 22 42 6 2 2 2 3
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Giải các phương trình sau:
1) 2 1 5 x 2) 2 1 5 x x
3) 3 1 2 x x 4) 3 2 2 x x
5) 2 1 5 x x 6) 3 2 x x
7) 2 3 2 1 x x 8) 2 1 4 1 0 x x 2
9) 2 5 4 3 1 1 2
3 2 3 1
x x
x x x x
10) 1 7 3 2
3 3 9
x x x
x x x
11) 5 296 2 1 3 1
16 4 4
x x
x x x
12)
2 4
1
2 1 2 1 2 1 2 1
x x
x x x x
13) 2 1 2 2
2 2
x
x x x x
14) 22 4
2 6 2 2 2 3
NA
14 tháng 3 2022 lúc 10:06
1) (3x-2)/3-2=(4x+1)/42) (x-3)/4+(2x-1)/3=(2-x)/63) 1/2 (x+1)+1/4 (x+3)=3-1/3 (x+2)4) (x+4)/5-x+4=x/3-(x-2)/25) (4-5x)/6=2(-x+1)/2 6) (-(x-3))/2-2=5(x+2)/4 7)2(2x+1)/5-(6+x)/3=(5-4x)/158) (7-3x)/2-(5+x)/5=1 9)(x-1)/2+3(x+1)/8=(11-5x)/310)(3+5x)/5-3=(9x-3)/4
1) (3x-2)/3-2=(4x+1)/4
2) (x-3)/4+(2x-1)/3=(2-x)/6
3) 1/2 (x+1)+1/4 (x+3)=3-1/3 (x+2)
4) (x+4)/5-x+4=x/3-(x-2)/2
5) (4-5x)/6=2(-x+1)/2
6) (-(x-3))/2-2=5(x+2)/4
7)2(2x+1)/5-(6+x)/3=(5-4x)/15
8) (7-3x)/2-(5+x)/5=1
9)(x-1)/2+3(x+1)/8=(11-5x)/3
10)(3+5x)/5-3=(9x-3)/4
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3A. Rút gọn các biểu thức sau:
a) 5x ^ 2 * (3x ^ 2 - 1) - 6x(4x ^ 3 - 3x + 1) - 2x ^ 3 * (3x - 1)
b) 1/2 * x(x ^ 2 - 2/5 * x + 2) - 3/4 * x ^ 2 * (x + 1/3) - x(x + 1) c) 1 1/2 * x ^ 2 * (x ^ 2 - 2x) - 2x(x ^ 3 + x ^ 2 + 1) + 2(x - 1)
d) x(x ^ 3 - 2x ^ 2) + 5x(x ^ 2 - 2x + 1/2) - x ^ 2 * (x ^ 2 - x + 1)
. Rút gọn các biểu thức sau:
3B a) 3x(- x ^ 2 - 5) + 5x(x ^ 3 + 7) - 3x ^ 2 * (x ^ 2 - x + 5) + 2(4 - x) ;
b) 25x - 4(3x - 1) + 7x(5 - 2x ^ 2) ;
c) 4x(x ^ 3 - 4x ^ 2) + 2x(2x ^ 3 - 3x ^ 2 +...
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3A. Rút gọn các biểu thức sau: a) 5x ^ 2 * (3x ^ 2 - 1) - 6x(4x ^ 3 - 3x + 1) - 2x ^ 3 * (3x - 1) b) 1/2 * x(x ^ 2 - 2/5 * x + 2) - 3/4 * x ^ 2 * (x + 1/3) - x(x + 1) c) 1 1/2 * x ^ 2 * (x ^ 2 - 2x) - 2x(x ^ 3 + x ^ 2 + 1) + 2(x - 1) d) x(x ^ 3 - 2x ^ 2) + 5x(x ^ 2 - 2x + 1/2) - x ^ 2 * (x ^ 2 - x + 1) . Rút gọn các biểu thức sau: 3B a) 3x(- x ^ 2 - 5) + 5x(x ^ 3 + 7) - 3x ^ 2 * (x ^ 2 - x + 5) + 2(4 - x) ; b) 25x - 4(3x - 1) + 7x(5 - 2x ^ 2) ; c) 4x(x ^ 3 - 4x ^ 2) + 2x(2x ^ 3 - 3x ^ 2 + 7x + 1) ; d) - 4/2 * x ^ 2 * (3x ^ 2 - 6x + 9) + 8x(x ^ 3 - 3x ^ 2 + 2x - 1) - x(x ^ 2 - 2x) 4A. Rút gọn các biểu thức sau: a) (4x - 1)(3x + 2) - 5x(x - 3) ; b) (5x - 2)(x + 1) - 2x(x ^ 2 + x - 3) ; c) (x + 1)(2x - 1) + x(x ^ 2 - x + 1) ; d) (3x ^ 2 + x + 2) * 0.3 - (2x + 1) * 0.2(3 + x) .
Bạn đăng từng bài 1 và tách bài ra cho dễ nhìn hơn nhé!
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3A:
a: =15x^4-5x^2-24x^4+18x^2-6x-6x^4+2x^3
=-15x^4+2x^3+13x^2-6x
b: =1/2(x^3-2/5x^2+2x)-3/4x^3-1/4x^2-x^2-x
=1/2x^3-1/5x^2+x-3/4x^3-5/4x^2-x
=-1/4x^3-29/20x^2
c: =3/2x^2(x^2-2x)-2x(x^3+x^2+1)+2(x-1)
=3/2x^4-3x^3-2x^4-2x^3-2x+2x-2
=-1/2x^4-5x^3-2
d: =x^4-2x^3+5x^3-10x^2+5/2x-x^4+x^3-x^2
=4x^3-11x^2+5/2x
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giải phương trình:
a) 2/x+1 - 1/x-3= 3x-11/x^2-2x-3
b) 3/x-2 +1/x=-2/x.(x-2)
c) x-3/x+3 - 2/x-3=3x+1/9-x^2
d) 2/x+1 - 1/x-2=3x-5/x^2-x-2
e) x-2/x+2 + 3/x-2=x^2-11/x^2-4
f) x+3/x+1 + x-2/x=2
g) x+5/x-5 - x-5/x+5=20/x^2-25
h) x+4/x+1 + x/x-1=2x^2/x^2-1
i) x+1/x-1 - 1/x+1=x^2+2/x^2-1
Bài 1: rút gọn a. ( x + 1)^2 - (x - 1)^2 - 3(x + 1)(x - 1)b. 5(x +2)(x -2) - 1/2(6 - 8x)^2 + 17c. (x^2 - 1)^3 - (x^4 + x^2 + 1)(x^2 - 1)d. (x^4 - 4x^2 +9)(x^2 + 3) - (3 + x^2)^3e. (x-3)^3 -(x - 3)(x^2 +3x + 9) + 6(x + 1)^2Bài 2: tìm xa. 25x^2 - 9 0b. (x + 4)^2 - (x + 1) (x -1) 16c. (2x - 1)^2 + (x + 3)^2 - 5(x + 7)(x - 7) 0d. (x + 2)(x^2 - 2x + 4) - x(x^2 + 2) 15e. (x + 3)^3 - x(3x + 1)^2 + (2x + 1)(4x^2 - 2x + 1) 28g. (x^2 - 1)^3 - (x^4 + x^2 + 1)(x^2 -1) 0HELP ME!!!!!!!!
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Bài 1: rút gọn
a. ( x + 1)^2 - (x - 1)^2 - 3(x + 1)(x - 1)
b. 5(x +2)(x -2) - 1/2(6 - 8x)^2 + 17
c. (x^2 - 1)^3 - (x^4 + x^2 + 1)(x^2 - 1)
d. (x^4 - 4x^2 +9)(x^2 + 3) - (3 + x^2)^3
e. (x-3)^3 -(x - 3)(x^2 +3x + 9) + 6(x + 1)^2
Bài 2: tìm x
a. 25x^2 - 9 = 0
b. (x + 4)^2 - (x + 1) (x -1) = 16
c. (2x - 1)^2 + (x + 3)^2 - 5(x + 7)(x - 7) = 0
d. (x + 2)(x^2 - 2x + 4) - x(x^2 + 2)= 15
e. (x + 3)^3 - x(3x + 1)^2 + (2x + 1)(4x^2 - 2x + 1) = 28
g. (x^2 - 1)^3 - (x^4 + x^2 + 1)(x^2 -1) = 0
HELP ME!!!!!!!!
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