a, 9x - 2.(x-29)= -47 <=> 9x- 2x+ 58= -47 <=> 7x= -105 <=> x= -15 b, 2x- 5.(x+ 5)= 15 <=> 2x- 5x- 25= 15 <=> -3x = 40 <=> x= -40/ 3 c, 3x. 19= 2.(x-5) +1 <=> 3x. 19= 2x -9 <=> x= 10
a) 9x - 2x - 58 = -47
7x = -47 + 58
7x = 11
x = 11/7
b) 2x - 5x + 25 = 15
-3x = 15 - 25
-3x = -10
x = 10/3
c) 57x = 2x - 10 + 1
57x - 2x = -10 +1
55x = -9
x = -9/55
Tìm x biết :
a)(3x-3)+(x-2)=(2x-2)-(x-1).
b)(4x-3)+(3x+5)=3x-2.
c)(6x-8)-5(x+2)=2x-12.
d)(9x-2)-4(2x+5)=-12.
Tìm x biết:
a)(2x-3)-(x-5)=(x+7)-(x+2)
b)(7x-5)-(6x+4)+(2x+3)-(2x+1)
c)(9x-3)-(8x+5)=(3x+2)
d)(x+7)-(2x+3)=(3x+5)-(2x+4)
bài 19: tìm x
a) 5 . ( x - 7 ) = 0
b) 25 ( x - 4 ) = 0
c) ( 34 - 2x ) . ( 2x - 6 ) = 0
d) ( 2019 - x ) . ( 3x - 12 ) 0
e) 57 . ( 9x - 27 ) = 0
f) 25 + ( 15 - x ) = 30
g) 43 - ( 24 - x ) = 20
h) 2 . ( x - 5 ) - 17 = 25
i) 3 . ( x + 7 ) - 15 = 27
j) 15 + 4 . ( x - 2 ) = 95
k) 20 - ( x + 14 ) = 5
l) 14 + 3 . ( 5 - x ) = 27
1, Tính nhanh nếu có thể:
a) 18 - 10 : 2 - 7
b) ( 6 . 8 - 10 : 5 ) + 3 . ( -7)
c) -8 . 25 . ( -2) - 4 . ( -5)
d) 19 . 25 - 19 . 95 - 19 . 20
e) -256 . 43 - 256 . 25 - 256 . 32
g) -159 . 56 + 43 . ( -159 )
h) 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
2, Tìm x:
a) -3x + 6 = -9
b) 10 - 2x = 20 - 4x
c) ( x + 5 ) . ( x + 4 ) = 0
d) ( -2x - 10 ) . ( 3x + 18 ) = 0
e) ( x - 1 ) . ( x + 2 ) . ( -x - 3 ) = 0
3, Cho: A = 1 - 2 + 22 - 23 + ... - 22015 + 22016
a) Tính A
b) Tìm x , biết: 3A - 1 = 2
Tìm x biết :
a) 350 - 6. ( x -2 ) = 230
b) ( 3x - 19) . 5 = 54
c) 8x + 9x + 3x = 200
bài 19: tìm x
c) ( 34 - 2x ) . ( 2x - 6 ) = 0
d) ( 2019 - x ) . ( 3x - 12 ) 0
e) 57 . ( 9x - 27 ) = 0
f) 25 + ( 15 - x ) = 30
g) 43 - ( 24 - x ) = 20
h) 2 . ( x - 5 ) - 17 = 25
i) 3 . ( x + 7 ) - 15 = 27
j) 15 + 4 . ( x - 2 ) = 95
k) 20 - ( x + 14 ) = 5
l) 14 + 3 . ( 5 - x ) = 27
nhanh nha, mik tick cho, ccau trình bày dễ hiểu, ko cần ''hoặc''
bài 19: tìm x
c) ( 34 - 2x ) . ( 2x - 6 ) = 0
d) ( 2019 - x ) . ( 3x - 12 ) 0
e) 57 . ( 9x - 27 ) = 0
f) 25 + ( 15 - x ) = 30
g) 43 - ( 24 - x ) = 20
h) 2 . ( x - 5 ) - 17 = 25
i) 3 . ( x + 7 ) - 15 = 27
j) 15 + 4 . ( x - 2 ) = 95
k) 20 - ( x + 14 ) = 5
l) 14 + 3 . ( 5 - x ) = 27
nhanh nha, mik tick cho, ccau trình bày dễ hiểu, ko cần ''hoặc''
1 . Tính hợp lí :
a . 727 - ( 182 + 727 )
b. ( 258 - 79 ) - ( 121 - 142 )
c. 2016 - ( 391 + 2016 ) - 9
d. 15 . 12 - 3 . 5. 10
e. 45 - 9 . ( 13 + 5 )
g . 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
2. Tìm x thuộc Z , biết :
a. 4 . ( x + 1 ) - ( 3x - 1 ) = 14
b. ( x2 - 9 ) . ( x + 2 ) = 0
c . ( x 2 + 9 ) . ( 2x - 4 ) = 0
d. xy + 2x - y = 0
bài 1 : Tìm x
a, 2.(x+3) - 3x=-2x+7
b, 5.(x-3) -29=2 .(7-x) -23
c, -17 + | 5-x |= -2 . 7
d, 21-|x+7|= -42 : (-2)
f, | 3x- 5 | - (-15) = 5
GIÚP MÌNH TRONG TỐI NAY NHÉ THANKS
