`2/5+(-4/3)+(-1/2)`
`=2/5 - 4/3 -1/2`
`= 6/15 - 20/15 -1/2`
`=-14/15 - 1/2`
`=-28/30 - 15/30`
`=-43/30`
`2/5 + (-4/3) + (-1/2)`
`=2/5 - 4/3 - 1/2`
`=12/30 - 40/30 - 15/30`
`=(12-40-15)/30`
`=(-43)/30`
Câu 15 A= 1/3-3/4+3/5+1/2007-1/36+1/25-2/9
Câu 16 A=1/3- 3/4- (-3/5)+ 1/64- 2/9- 1/36+ 1/15
Câu 17 A=1/2- 2/3+ 3/4- 4/5+ 5/6- 6/7- 5/6+ 4/5- 3/4+ 2/3- 1/2
( 3-1/4 + 2/3 ) - ( 5 + 1/3 - 6/5 ) - ( 6- 7/4 - 3/2 )
Bài 6 : Tính giá trị các biểu thức .
a. A = -5/7 + 7/-5 + 4/7 + 7/4 .
b. B = 2/-5 + -3/7 + -7/10 + 3/-8 .
c. C = -5/7 + 2/-7 + 4/-9 + 4/9 .
d. D = ( 3 - 3/4 + 2/3 ) - ( 2 + 4/3 - 3/2 ) - ( 1 - 7/3 - 9/2 ) .
thực hiện phép tính
a, (3/5+-3/4+1/20):1/2-1/2
b,12/3::1/6+11/4.(1/2-1/5)
c,0,75-(13/11-50%):5/11
d,1/27:(-1/3)2+75%.(-22/3)
Giải giúp mình với
giaỉ thích : vd: -22/3 là âm 2 phần 3...
điền số thích hợp vào ô trống
\(\dfrac{1}{3}+\left(\dfrac{3}{4}-1\dfrac{2}{5}\right)< \overline{ }< 2\dfrac{1}{7}+\left(\dfrac{-2}{5}-\dfrac{1}{4}\right)\)
\(\dfrac{7}{3}+\left(\dfrac{3}{4}-\dfrac{1}{5}\right)>\overline{ }>\dfrac{2}{3}+\left(\dfrac{-1}{4}+\dfrac{2}{7}\right)\)
tim x
\(\dfrac{5}{6}x-\dfrac{3}{4}=\dfrac{-1}{4}+\dfrac{2}{3}\)
\(-1\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{5}{6}-\left(\dfrac{-2}{5}\right)\)
\(\left(\dfrac{4}{5}:x+1,5\right):\dfrac{2}{3}=-1,5\)
\(\dfrac{4}{3}x-\dfrac{2}{3}=\dfrac{1}{4}-x\)
giup minh nhe minh dang can gap
tìm x , biết
a) 17/6- x( x-7/6)= 7/4
b) 3/35 - ( 3/5-x)= 2/7
tìm x thuộc Z , biết
3/4-5/6 < x/12 < 1 -( 2/3-1/4)
tìm x biết
a ) 2x-3=x + 1/2
b) 4x- ( x+ 1/2) = 2x - ( 1/2 - 5 )
e) \(\dfrac{3}{3x}-\dfrac{3}{12}=\dfrac{4}{5}-\left(\dfrac{7}{x}-2\right)\)
f) \(\dfrac{1}{x-1}+\dfrac{-2}{3}\left(\dfrac{3}{4}-\dfrac{6}{5}\right)=\dfrac{5}{2-2x}\)
1.Tìm x, biết:
a) 7/8 + x = 4/7 b) 6 – x = (-3)/4 c) 1/(-5) + x = 3/4 d) –6 – x = (-3)/5
e) - 2/6 + x = 5/7 f) -8 – x = (-5)/3 g) - 2/10 – x = - 9/8 h) 8 – x = (-1)/6
i) - 2/5 + x = 5/7 j) -2 – x = (-5)/3 k) - 1/6 – x = - 9/8 l) 8 – x = (-1)/5
2. Tính:
a) -7/3 + 4/9 b) -8/18 - 15/56 c) (-7) - (-3/4) d) 0,15 + (-5/12)
e) -1/42 + -1/28 f) -1/21 + -1/36 g) 5,5 - (-2/7) h) 0,9 - (-4/7)
a)\(\dfrac{-12}{15}+\dfrac{-4}{26}\) b)\(5\dfrac{1}{3}-2\dfrac{4}{5}\)
c)\(\dfrac{4}{5}-\left(-\dfrac{2}{7}\right)+-\dfrac{5}{10}\) d)\(-1\dfrac{2}{7}+\dfrac{3}{14}-\dfrac{5}{21}\)
e)\(12-\dfrac{11}{121}+\left(-\dfrac{8}{9}\right)-\left(-\dfrac{3}{7}\right)\) f) \(\dfrac{11}{12}-\left(1\dfrac{3}{4}\right)-\dfrac{2}{16}\)
