625 -25 x X =0
(2x - 1 . 5 + 60 ) : 50 + 3 = 5
250 : 52 + 2 x = 22 . 5
( 261 : x + 1 ) . 3 + 10 = 100
125.2 : 50 + 2x = 17
62x + 14 = 50
324 + 16 : x= 328
5x - 22. 3 = 23
Những câu hỏi liên quan
a. 2/3x-1/2=1/10
b. 39/7:x=13
c. (14/5x-50):2/3=51
d. (x+1/2)(2/3-2x)=0
e. 2/3x-1/2x=5/12
g. (x.44/7+3/7)11/5-3/7=-2
h. x.13/4+(-7/6)x-5/3=5/12
i.93/17:x+(-4/17):x+22/7:52/3=4/11
j. 17/2-|2x-3/4|=-7/4
k. (x+1/5)^2+17/25=26/25
l. -32/27-(3x-7/9)^3=-24/27
a) \(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)
\(\dfrac{2}{3}x=\dfrac{1}{10}+\dfrac{1}{2}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{9}{10}\)
b) \(\dfrac{39}{7}:x=13\)
\(x=\dfrac{\dfrac{39}{7}}{13}=\dfrac{3}{7}\)
c) \(\left(\dfrac{14}{5}x-50\right):\dfrac{2}{3}=51\)
\(\dfrac{14}{5}x-50=51\cdot\dfrac{2}{3}=34\)
\(\dfrac{14}{5}x=34+50=84\)
\(x=\dfrac{84}{\dfrac{14}{5}}=30\)
d) \(\left(x+\dfrac{1}{2}\right)\left(\dfrac{2}{3}-2x\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=0\\\dfrac{2}{3}-2x=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{1}{3}\end{matrix}\right.\)
e) \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)
\(\dfrac{1}{6}x=\dfrac{5}{12}\)
\(x=\dfrac{5}{12}:\dfrac{1}{6}=\dfrac{5}{2}\)
g) \(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\dfrac{11}{5}-\dfrac{3}{7}=-2\)
\(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\cdot\dfrac{11}{5}=-2+\dfrac{3}{7}=-\dfrac{11}{7}\)
\(x\cdot\dfrac{44}{7}+\dfrac{3}{7}=-\dfrac{11}{7}:\dfrac{11}{5}=-\dfrac{5}{7}\)
\(\dfrac{44}{7}x=-\dfrac{5}{7}-\dfrac{3}{7}=-\dfrac{8}{7}\)
\(x=-\dfrac{8}{7}:\dfrac{44}{7}=-\dfrac{2}{11}\)
h) \(\dfrac{13}{4}x+\left(-\dfrac{7}{6}\right)x-\dfrac{5}{3}=\dfrac{5}{12}\)
\(\dfrac{25}{12}x-\dfrac{5}{3}=\dfrac{5}{12}\)
\(\dfrac{25}{12}x=\dfrac{5}{12}+\dfrac{5}{3}=\dfrac{25}{12}\)
\(x=1\)
Mỏi tay woa bn làm nốt nha!!
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a x e x
b x f x
c x x
2
3
2 1 1 1 17 26
3 2 10 5 25 25
4 2 5 7 24
2 50 51 1 3
5 3 27 9 27
1 2
2 0
2 3 ) :
) ) ,
g x
d x h x x
3 1
1 4
7 28
17 3 7 2 7
2 0 5
2 4 4 3 12
Bài 1. Thực hiện phép tính (Tính nhanh nếu có thể ) 1) 347.22 - 22. ( 216 + 184 ) : 8; 2) 132 - [116 - (132 - 128 )2] 3) 16 :{400 : [200 - ( 37 + 46. 3 )]}; 4) {184 : [96 - 124 : 31 ] - 2 }. 3651; 5) 46 - [ (16 + 71. 4 ) : 15 ]} - 2; 6) 33.18 + 72.42 - 41.18 7) ( 56. 46 – 25. 23 ) : 23; 8) ( 28. 54 + 56. 36 ) : 21 : 2; 9) ( 76. 34 - 19. 64 ) : (38. 9); 10) ( 2+ 4 + 6 +.. + 100).(36.333-108. 111) ; 11) ( 5. 411- 3.165 ): 410 ; 12)
Bài 2. Tính: A [(- 8 ) + ( - 7 ) ] + ( -10); B - ( - 299 ) + ( -...
Đọc tiếp
Bài 1. Thực hiện phép tính (Tính nhanh nếu có thể ) 1) 347.22 - 22. ( 216 + 184 ) : 8; 2) 132 - [116 - (132 - 128 )2] 3) 16 :{400 : [200 - ( 37 + 46. 3 )]}; 4) {184 : [96 - 124 : 31 ] - 2 }. 3651; 5) 46 - [ (16 + 71. 4 ) : 15 ]} - 2; 6) 33.18 + 72.42 - 41.18 7) ( 56. 46 – 25. 23 ) : 23; 8) ( 28. 54 + 56. 36 ) : 21 : 2; 9) ( 76. 34 - 19. 64 ) : (38. 9); 10) ( 2+ 4 + 6 +.. + 100).(36.333-108. 111) ; 11) ( 5. 411- 3.165 ): 410 ; 12)
Bài 2. Tính: A= [(- 8 ) + ( - 7 ) ] + ( -10); B = - ( - 299 ) + ( - 219 ) + ( -401 ) + 12 C = 555 + ( - 100) + ( -80) + ; D = + ( - 40 ) + 3150 + ( - 307) E= 98.42 - {50.[(18 - 23): 2 + 32 ]}; F = - 80 - [ - 130 - ( 12 - 4 )2] + 20080 G = 1000 + ( - 670 ) + 297 + (- 330); H = 1024 : 24 + 140 : ( 38 + 25) - 723 : 721 I = ; K = 219 +573 + 381 - 173 L = 36. 33 - 105. 11 + 22. 15; N = 160 - ( 2 3.52 - 6. 25 ) O = (44. 52. 60 ) : ( 11. 13.15 ); P = (217 +154). ( 3 19 - 217 ). ( 24 - 42) Q = 100 + 98 + 96 +... + 4 +2 - 97 - 95 -... - 3 - 1
Bài 3. Tìm x N biết: a) 280 - ( x - 140 ) : 35 = 270; b) (190 - 2x ) : 35 - 32 = 16; c) 720 : [ 41 - ( 2x - 5 ) ] = 23.5 d) ( x : 23 + 45 ). 37 - 22 = 24. 105; e) ( 3x - 4 ). ( x - 1 )3 = 0; f) 22x-1 : 4 = 83 g) x17 = x; h) ( x - 5 )4 = ( x - 5 )6 ; i) ( x + 2 ) 5 = 210 ; k ) 1 + 2 + 3 +... + x = 78 l) ( 3.x – 24). 73 = 2.74; n) 5x : 52 = 125; m) ( x + 1) 2 = ( x + 1)0 ; o) ( 2 + x ) + ( 4 + x ) + ( 6 + x ) +... + ( 52 + x ) = 780 ; p) 70 x, 80 x và x > 8 q) x 12, x 25, x 30 và 0 < x < 500
Bài 4. Tìm x Z biết: a) ( - x + 31 ) - 39 = - 69 ; b) - 121 - ( - 35 - x ) = 50; c) 17 + x - ( 352 - 400 ) = - 32 d) 2130 - ( x + 130 ) + 72 = - 64; e) ; f) ; g) h) ; i) ( x - 2 ) - ( -8 ) = - 137; k) 15-(- x + 18) = - 24 l) 12 - = -19; m) 10 -
Bài 5. Tìm n N biết: a) 8 ( n - 2 ); b) ( 2.n +1 ) ( 6 - n ); c) 3.n ( n - 1 ); d) ( 3.n + 5) ( 2.n +1)
Bài 6. Tìm x, yN để : a) ( x + 22 ) ( x + 1); b) ( 2x + 23 ) B ( x - 1); c) ( 3x + 1 ) ( 2x - 1) d) ( x - 2 ) ( 2y + 1 ) = 17; e ) xy + x + 2y = 5
Bài 7. Tìm các cặp số nguyên x, y biết a) ( x - 1 ) ( y + 2 ) = 7; b) x. ( y - 3 ) = - 12; c) xy - 3x - y = 0 d) xy + 2x + 2 y = -16
Bài 8. Bỏ dấu ngoặc rồi rút gọn biểu thức a) - ( - a + c - d ) - ( c - a + d ); b) - ( a + b - c + d ) + ( a - b - c -d ) c) a( b - c - d ) - a ( b + c - d ); d*) (a+ b).( c + d) - ( a + d ) ( b + c ) e*)( a + b ) ( c - d ) - ( a - b )(c + d); f*) ( a + b ) 2 - ( a - b ) 2
-4(5-x)=-3(6-x)
-3(x-8)-(2x-7)=35
2. Tính tổng
1+(-2)+3+(-4)+...+49+(-50)
1-2+3-4+...+99-100
2-4+6-8+...+49-50
Tính hợp lý
24(16-5)-16(24-5)
29-(19-13)-19(29*13)
31*(-18)+31*(-81)-31
(-12)*47+(-12)*52+(-12)
13(23+22)-3(17+28)
1, x^2-3=22
2, 2x^3+5=-11
3, (x+2)^2=81
4, (2x+1)^2=25
5, 5^x+2=625
6 , (2x-3)^2=36
7,(2x-1)^3=-8
8, (x-1)^x+2=(x-1)^x+6 voi x thuoc z
9, x^2+x=0
Bài làm
a) x² - 3 = 22
=> x² = 25
=> x = + 5
Vậy x = + 5
b) 2x³ + 5 = -11
2x³ = -16
x³ = -8
x = -2
Vậy x = -2
c) ( x + 2 )² = 81
=> x + 2 = 9
=> x = 7
Vậy x = 7
d) ( 2x + 1 )² = 25
=> 2x + 1 = 5
=> 2x = 4
=> x = 2
Vậy x = 2
e) 5x + 2 = 625
5x = 623 ( vô lí )
g) ( 2x - 3 )² = 36.
=> 2x - 3 = 6
=> 2x = 9
=> x = 4,5
Vậy x = 4,5
h) ( 2x - 1 )³ = -8
=> 2x - 1 = -2
=> 2x = -1
=> x = -1/2
Vậy x = -1/2
i) ( x - 1 )x + 2 = ( x - 1 )x + 6
=> [ (x - 1 )x - ( x - 1 )x ] = 6 - 2
=> 0 = 4 ( vô lí )
Vậy x thuộc rỗng.
k) x² + x = 0
=> x( x + 1 ) = 0
=> x = 0 hoặc x + 1 = 0
=> x = 0 hoặc x = -1
Vậy x = 0 hoặc x = -1
tim so nguyen x bt
x – 18 = 22 – 47
b) 4 2 – x = 53 – 60
c) 25 – 2x = 16 – 3x
d) x – (47 – 22) = 5+ (10 – 4x)
a) x- 18 = - 25
x =( -25 ) + 18
x = -7
b) 42 - x = 53 - 60
16 - x = 65
x = 16 - 65
x = -49
Câu 1:
a) -2x-(x-17)=34-(-x+25)
b) 17x-(-16x-27)=2x+43
c) -2x-3(x-17)=34-2(-x+25)
d) 17x+3(-16x-37)=2x+43-4x
e) 3x-32>-5x+1
f)15+4x<2x-145
g)-3(2x+5)-16<-4(3-2x)
h) -2x+15<3x-7<19-x
i)x+(x+1)+(x+2)+(x+3)+....+13+14=14
j)25+24+23+...+x+(x-2)+(x-3)=25
Câu 2:
a) (x-3).(y+5)=-17
b) (x+1).(xy-2)=11
c) xy-7x+y=-22
d) xy-3x+y=-20
Câu 1:
a: =>-2x-x+17=34+x-25
=>-3x+17=x+9
=>-4x=-8
hay x=2
b: =>17x+16x+27=2x+43
=>33x+27=2x+43
=>31x=16
hay x=16/31
c: =>-2x-3x+51=34+2x-50
=>-5x+51=2x-16
=>-7x=-67
hay x=67/7
e: 3x-32>-5x+1
=>8x>33
hay x>33/8
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x^2-3=22
2x^3+5=-11
5^x+2=625
(x-1)^x+2=(x-1)^x+6 với xEZ
x^2+x=0
1. 3y = 0
2. 1+x=0
3. 1-2t=0
4. 2x+x+3=0
5. 25x-20=0
6. 51x=17
7. 2x-3=x+5
8. x-8=2x+3
9. 17-2x=3x-5
10. 2x+x+22=0
11. x-3=3x+5
12.15x+1/2=0
13. 3x+1=7x-11
14. 5-3x=6x+7
15. 11-2x=x-1
16. 15-8x=9-5x
17. 25-3x=4x-5
18. 0,25x+1,5=0
19. 3x-5/6=1/2
20. -2x+14=0
giúp mik nha chìu nay mik cần gấp
thanks
1. 3y = 0
=> y = 0
2. 1+x = 0
<+ x = -1
3.
\(1-2t=0\)
\(\Leftrightarrow2t=1\)
\(\Leftrightarrow\dfrac{1}{2}\)
4. 2x +x + 3 =0
\(\Leftrightarrow3x+3=0\)
\(\Leftrightarrow x=-3\)
5.
\(25x-20=0\)
\(\Leftrightarrow25x=20\)
\(\Leftrightarrow x=\dfrac{4}{5}\)
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7.
2x-3 = x+5
<=> 2x - x = 5+3
<=> x = 8
8.
x-8=2x+3
<=> x - 2x = 3+8
<=> -x = 11
<=> x = -11
9. 17-2x = 3x-5
<=> -2x-3x = -5-17
<=> -5x = -22
<=> x = \(\dfrac{22}{5}\)
10.
2x+x+22=0
<=> 3x+22=0
<=> 3x = -22
<=> x = \(\dfrac{-22}{3}\)
Mấy bài kia tự giải tương tự nhá!!!
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11.
x-3=3x+5
<=> x-3x=5+3
<=> -2x=8
<=> x = -4
12. 15x + 1/2 = 0
<=> 15x = -1/2
<=> x = -1/30
13.
3x+1 = 7x-11
<=> 3x-7x = -11-1
<=> -4x=-12
<=> x = 3
14.
5-3x = 6x + 7
<=> -3x-6x = 7-12
<=> -9x = -5
<=> x = 5/9
15.
11-2x=x-1
<=> -2x-x = -1-11
<=> -3x = -12
<=> x = 4
16.
15 - 8x = 9-5x
<=> -8x+5x = 9 - 15
<=> -3x = -6
<=> x=2
17.
25-3x=4x-5
<=> -3x-4x = -5-25
<=> -7x = -30
<=> x = 30/7
18.
0,25x+1,5=0
<=> 0,25x = -1,5
<=> x = -6
19.
3x-5/6 = 1/2
<=> 3x - 5/6 = 3/6
<=> 3x-5=3
<=> 3x = 8
<=> x = 8/3
20.
-2x + 14 =0
<=> -2x = -14
<=> x = 7
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