-5/7+(4,25-2/7)-(1,25-3/2)
=-5/7 + 111/28 - (-1/4)
=7/2=3,5
HT
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-5/7+(4,25-2/7)-(1,25-3/2)
=-5/7 + 111/28 - (-1/4)
=7/2=3,5
HT
giải tìm x
câu 1 : -4,25-(x-3/5)<7/2-0,15
câu 2 : 5/9+(-7/6)<x+2/3<4-1,75
Bài 1:
a) (6-2/3+1/2)-(5+5/3-2/3)-(3-7/3+5/2)
b)(-1/1/2:1,25)+(10/3/7:5/3/14)
c)(-2/3+1/7):121/42
Tính:
a) (1,25)^8. 8^17. (1,25)^8
b) (2,5)^7. 4^15. (2,5)^6
c) (0,25)^5.8^6.(0,25)^2
d) (1/2)^5. 8^6. (1/4)^5
e) (1/3)^7. 6^7. (1/2)^8
Giúp mk nha, mk tick cho
Cho A =[0,8*7+(0,8)2 ](1,25*7-4/5*1,25) +31,64.
B=(1,09-0,29)*5/4./(18,9-16,65)*8/9.
Hỏi A gấp mấy lần B?
Bài 1: Tìm 2 số hữu tỉ x và y sao cho x + y = xy = x : y (y khác 0)
Bài 2: Tính:
M = [(2/193 - 3/386) . 193/17 + 33/34] : [( 7/2001 + 11/4002) . 2001/25 + 9/2]
Bài 3: Cho A = [0,8 . 7 + (0,82] . (1,25 . 7 - 4/5 . 1,25) + 31,64
B \(\left(1,09-0,29\right).\frac{5}{4}\)trên \(\left(18,9-16,65\right).\frac{8}{9}\)
Hỏi A gấp mấy lần B?
Tìm x, biết:
a) \(\dfrac{2}{3}\)x - \(\dfrac{1}{2}\)x = \(\left(-\dfrac{7}{12}\right)\) . \(1\dfrac{2}{5}\)
b) \(\left(\dfrac{1}{5}-\dfrac{3}{2}x\right)^2\) = \(\dfrac{9}{4}\)
c) (1,25 - \(\dfrac{4}{5}\)x)3 = -125
Tính:
A= 1-4+7-10+.......-2998+3001
B= (1- 1/2)(1- 1/3)(1-1/4).......(1-1/100)
C= (0,8 × 7 + 0,8^2) . (1,25 × 7 × 1,25) + 31,64
D= 9/10×1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
E= 1/2003+1/2004 - 1/2005
-----------------________________
5/2003+5/2004-5/2005
Bài 4: tìm x:
a) \(\dfrac{4}{3}\) + (1,25 - x) = 2,25
b) \(\dfrac{17}{6}\) - (x - \(\dfrac{7}{6}\) ) = \(\dfrac{7}{4}\)
c) 4 - (2x + 1) = 3 - \(\dfrac{1}{3}\)
bài 15:
a) (\(\dfrac{-2}{3}\))9 : x = (\(\dfrac{-2}{3}\))
b) x : (\(\dfrac{4}{9}\))5 = (\(\dfrac{4}{9}\))4
c) (x + 4)3 = -125
d) (10 - 5x)3 = 64
e) (4x + 5)2 = 81
Bài 16:
a) 4 - \(1\dfrac{2}{5}\) - \(\dfrac{8}{3}\)
b) -0,6 - \(\dfrac{-4}{9}\) - \(\dfrac{16}{15}\)
c) \(-\dfrac{15}{4}\) . (\(\dfrac{-7}{15}\)) . (\(-2\dfrac{2}{5}\)
Gi ải gấp giúp mình ạ, mình rất cần gấp
A =15/34 + 7/21 + 9/34 - 1 15/17 + 2/3
B = 16 2/7 : ( - 3/5 ) - 28 2/7 : ( - 3/5 )
C = 25.(- 1/3) 3 + 1/5 - 2.( - 1/2 )2 -1/2
D = ( - 2 )3 . ( 3/4 - 0,25 ) : ( 2 1/4 - 1 1/6 )
F = ( - 3/2 )2 + |- 5/6 | - 1 1/2 : 6
I = - 1,53 : ( 5 5/28 - 1 8/9 .1,25 + 1 16/63 )