2\(x\)( 0,5 + \(\dfrac{2}{3}\)) : \(\dfrac{7}{3}\) = 0,25
2\(x\)( \(\dfrac{1}{2}\) + \(\dfrac{2}{3}\)) = 0,25 \(\times\) \(\dfrac{7}{3}\)
2\(x\) \(\times\) \(\dfrac{7}{6}\) = \(\dfrac{7}{12}\)
2\(x\) = \(\dfrac{7}{12}\) : \(\dfrac{7}{6}\)
2\(x\) = \(\dfrac{1}{2}\)
\(x\) = \(\dfrac{1}{2}\):2
\(x\) = \(\dfrac{1}{4}\)
25% - 3/2 + 0,5 . 12/5
0,25 . 7/3 . 30 . 0,5. 8/45
c) 9/23 . 5/8 + 9/23 . 3/8 - 9/23
A= ( -6,17 + \(3\dfrac{5}{9}\) - \(2\dfrac{36}{97}\)) . (\(\dfrac{1}{3}\) - 0,25 - \(\dfrac{1}{12}\))
B= \(\dfrac{0,5-\dfrac{3}{17}}{\dfrac{5}{6}-\dfrac{5}{17}}\) + \(\dfrac{0,5-\dfrac{1}{3}-0,2}{\dfrac{7}{5}+\dfrac{7}{3}-3,5}\)
tìm x biết
a, 1/2 - 3/4x > 0,25
b, 2x - 0,75 < 1/2
c, 0,5 - 3x > 4/5
Tính nhanh:
a) 24,8 : 0,5 + 24,8 x 3 + 24,8 : 0,2
b) 19,5 + 19,5 x 3 + 19,5 : 0,5 + 19,5 : 0,25
c) 121,07 x 4 + 121,07 : 0,25 + 121,07 : 0,5
rút gọn:
C=\(\frac{0,25-\frac{1}{5}+\frac{1}{7}}{0,375-\frac{3}{5}+\frac{3}{7}}+\frac{\frac{1}{2}+\frac{1}{3}-0,2}{\frac{3}{4}+0,5-\frac{3}{10}}\)
Bài 1: Thực hiện phép tính (tính hợp lí nếu có thể):
1) 0,35.12,4
2) 0,5 - 0,4 + (-2,34)
3) 0,25 - 2,9 + 4,75
4) 2,5.(-0,124) + 10,124.2,5
5) -3/7 + 5/13 + -4/13
6) -5/21 + (-2/21) + 8/24
Tìm x biết:
a) \(\left(3\dfrac{1}{2}+2x\right).3\dfrac{2}{3}=5\dfrac{1}{3}\)
b) \(\left(\dfrac{x}{7}+0,25\right)=\dfrac{-1}{28}\)
1. | 4-2x | . 1/3 = 1/3
2. (-3)² : | x+(-1) | = (-3)
3. | 3/2 -x | + (-4/5) = -14/5
4. (-4/3) - | 2x + (-1) | = -7/3
5. -9 . | 36 - x/2 | = (-54)
6. 0,75 - | (-x) + 1/3 | = 0,25
7. (-6/5) + | x-9 |= (-6/5)
8. (-4) . | 3x - 1/5 | = 12
[x+80];5=40
[x-0,5];[1+1/2]=0,25
[1/1.2+1/2.3+1/3.4;x=1/2
25-[x+1,85];3=7
2/3;x/5=10/21
giup minh nha minh se tich cho cac ban
