a) 41
b) -\(\dfrac{1}{4}\)
c) \(\dfrac{13}{56}\)
\(a.41\\ b.-0,25\\ c.\text{0.232142857 }\)
a) 41
b) -\(\dfrac{1}{4}\)
c) \(\dfrac{13}{56}\)
\(a.41\\ b.-0,25\\ c.\text{0.232142857 }\)
1 . tính :
6/7 + -5/8 : ( -5 ) - 3/16 . ( -2 )2
2 .tính nhanh :
-17/25 . 20/33 + -17/25 . 13/3 + -3/25
3 . tìm x , biết :
a . 3/5 . x - 7/10 . x = -1/2
b . ( x -2,5 ) : 2 1/2 - 2, = 1 1/4
c . ( 2,5 x - 3,6 ) : 1 5/7 = -1
A:Hỗn số 3 1/2+ 2 2/3
B hỗn số 7 1/8- 5 3/4
C hỗn số 4 3/ 7 .5
D hỗn số 3 1/2: 6 4/5
1) Tìm x
x - 35% . x = 1/25
2) Tính
a) 17 2/31 - ( 15/17 + 6 2/31 )
b) 27 51/59 - ( 25 51/29 - 1 1/3 )
c) ( 4 5/23 - 2 2/5 + 7 7/13 ) - ( 3 5/23 - 6 6/13 )
d) 8 1/3 + 7,8 + 5 2/3 - 1,8
Bài 1 : Thực hiện phép tính ( tính nhanh nếu có thể)
a, 45 - 9 . (13+5) b, 14 . (19-17) - 19. (29-28)
c, 2. (-4 -14): (-3) d, (-6-3) . (-6+3)
e, ( 7 - 10) + 138 : ( -3) g, (-8) 2 . 32)
f, 35: (-5) - 7 . (5-18) h, 92 . (-5) . 4
1) (4\(\dfrac{5}{57}\) - 3\(\dfrac{4}{51}\) + 8\(\dfrac{13}{29}\) ) - ( 3\(\dfrac{5}{57}\) - 6\(\dfrac{16}{29}\) )
2) \(\dfrac{6}{7}\) + \(\dfrac{5}{8}\) : 5 - \(\dfrac{3}{16}\) . (-2)\(^2\)
3) 1\(\dfrac{13}{15}\) . 0, 75 - ( \(\dfrac{104}{195}\) + 25% ) . \(^{\dfrac{24}{47}}\) - 3\(\dfrac{12}{13}\) :3
4) [ 80% : \(\dfrac{1}{2}\) - 2 . 0, 75 + (-3)\(^2\) . \(\dfrac{1}{6}\) ] : \(\dfrac{1}{10}\) + 1\(\dfrac{1}{5}\) . ( \(\dfrac{1}{3}\) - \(\dfrac{1}{2}\) )
F=0,7 . 2 phan 2 phan 3 . 20 . 0,375 . 5/28
tìm x , biết
1 . 3 3/4 : x = 1 1/2
2 . 1 1/4 x + 2 1/2 = 1 1/4
3 . ( 3 1/3 - 1 1/2 x ) : 5/6 = 1 1/2
4 . ( 3/7 x - 1 ) : 4 = -1/28
5 . 2 2/3 x - x = 3 3/4
6 . | x - 3/4 | = 1
7 . | 2/3 x + 1/3 | = 5/6
Tính giá trị của biểu thức sau :
\(A=8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)
\(B=\left(10\dfrac{2}{9}+2\dfrac{3}{5}\right)-6\dfrac{2}{9}\)
câu 1: tìm x, biết
a, 5,2 x + 7 2/5 = 6 3/4
b,2,4 :( -1/2 -x)=1 3/5