\(3+\left(x\cdot4\right)-14=1\Leftrightarrow4x=12\Leftrightarrow x=3\)
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tìm x , biết
1) x : 2 1/3 = -1,5 4) x - 15% = 1/3
2) 2,5 . x = 11/15 5) ( 3/7x + 1 ) : ( -4 1/7 )
3) 30%x = -1,2 6) x - 35%x = 1/25
chú ý : / là phần nha
Bài 1: Tìm x, biết:
a, 2/1/4x - 9/1/4 = |-20|
b, 1/2x + 2/3. ( x-2) =1/3
c, x- 25% = 6/11. (1/2+ 3/4 - 1/3)
d, - (-23) + (-36) - |-57| + (-29) .2
e, x/30 = 3/10 + -1/15
f, (x - 1/4) : 4/5 = 15/16
g, 1/3/5- 7/12 :x - -9/4
h, (2/4/5. x +50 ). 2/3 = -51
-5/8=x/16
Y/10=(-4)/8
Bai 8:
1) x/3-1/4=(-5)/6
2) x+3/15=1/3
3) x-12/4=1/2
4) 3/4x=1/2
Tìm x \(\in\) Z biết;
a) \(\dfrac{x}{15}=\dfrac{4}{y}=\dfrac{-2}{5}\)
b) \(\dfrac{x-3}{4}=\dfrac{15}{20}\)
c) \(\dfrac{-5}{9}+\dfrac{-8}{15}+\dfrac{22}{-9}+\dfrac{-7}{15}< x\le\dfrac{-1}{3}+\dfrac{-1}{4}+\dfrac{-5}{12}\)
Bài 1: Tìm x , biết:
1) x - 2 -6 12) 3 . | x - 1 | - 5 7
2) -5 . x - ( -3 ) 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) 5
3) 15 - ( x - 7 ) -21 14) ( x - 2 ) . ( x + 4 ) 0
4) 3 .x + 17 2...
Đọc tiếp
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
Tính nhanh :
1 + 7 + 8 + 15 + 23 + ... + 160
1 + 4 + 5 + 9 + 14 + ... + 60 + 97
78 x 31 + 78 x 24 + 78 x 17 + 72 x 22
A = 1 x 4 + 2 x 5 + 3 x 6 + 4 x 7 + .... n x ( n+ 3 )
Giúp mình nha,ai làm chi tiết và đúng mình tích 15 cái
Tính:
S1:(1/2-1)x(1/3-1)x(1/4-1)x..............x(1/100-1)
S2:3/22x8/32x10/42x...............x899/302
S3:55+56+...............+5100
S4:7/10x11+7/11x12+.................+7/69x70
S5:15/90x95+15/94x98+.....................+15/146x150
S6:10/56+10/140+10/28+...................+10/1400
gs mk nhé !
a) 52.49+48.38-52.20-48.11b)2.54.12+4.6.68-3.8.22c)24+31.24.64+24.8d)19:3+28:3+13:3e)32.15-{[(102.15-15.90)-43.2)bài 2: tìm xϵNa)322x128b)(x+1)2.3245:43-20c)92-3(x-3) bằng 157:156d)3x.310 bằng 317e)81.3x+1 bằng 315
Đọc tiếp
a) 52.49+48.38-52.20-48.11
b)2.54.12+4.6.68-3.8.22
c)24+31.24.64+24.8
d)19:3+28:3+13:3
e)32.15-{[(102.15-15.90)-43.2)
bài 2: tìm xϵN
a)32<2x<128
b)(x+1)2.3245:43-20
c)92-3(x-3) bằng 157:156
d)3x.310 bằng 317
e)81.3x+1 bằng 315
Tìm X biết:
1) X - 105 : 21 = 15
2) ( X - 105 ) : 21 = 15
3) ( 32 + X ) : 17 = X
4) 1818 : ( 6X - 37 ) = 18