\(0,5\div\left(20\%+\frac{\frac{2}{3}}{5}\right)\)
\(=\frac{5}{10}\div\left(\frac{20}{100}+\frac{2}{3}\div5\right)\)
\(=\frac{5}{10}\div\left(\frac{20}{100}+\frac{2}{15}\right)\)
\(=\frac{5}{10}\div\left(\frac{300}{1500}+\frac{200}{1500}\right)\)
\(=\frac{5}{10}\div\frac{500}{1500}\)
\(=\frac{5}{10}\times\frac{1500}{500}\)
\(=\frac{7500}{5000}\)
\(=\frac{3}{2}\)
\(=1,5\)
a) (-1,25).17/21.(-0,4).7/34
b)0,5\(^{^{x+1}}\) + 0,5\(^x\) = 1,5
c) x:20-25%x=-1\(\dfrac{1}{5}\)
d) (x-1)\(^2\) =1
e) 5\(^3\) : 25+2\(^4\) :4
bài 1
a,20%*x+5/8-x*0,5=11/20
b,
1. \({3\over 2}x\)+\({1\over 6}\)=\(3{1\over 6}\)
2. x +20% x = 3,6
3. 0,5 x -\({2\over 3}x\)=40%
4. (0,5-\({2\over 3}x\)):\({9\over 10}\)=\({-5\over 3}\)
giúp mình với cac bn ơi
1,Tính
C=0,5+1/3+0,4+5/7+1/6-4/35+1/41
D=1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
Tính
C = 0,5 + 1/3 + 0,4 + 5/7 + 1/6 - 4/35 + 1/41
D = 1/90 - 1/72 - 1/56 - 1/42 - 1/30 - 1/20 - 1/12 - 1/6 - 1/2
Bài 5 (0,5 điểm): Tính A = 20 + 21 + 22 + 23 + .... + 219.
\(\dfrac{5}{9}\):\(\dfrac{13}{7}\)+\(\dfrac{5}{9}\):\(\dfrac{13}{9}\)-1\(\dfrac{2}{3}\)
4\(\dfrac{2}{5}\):0,5%-1\(\dfrac{3}{7}\).14%+(-0,5)
Tính giúp mik với!!! Mình cảm ơn
Tính nhanh:
(-0,5)20.(-3)3.220
1. Tính:
a. 3/7 + 1/7 x 4/5 - 1
b. (3/20 + 1/2 - 1/15) x 12/49
______________________
7/2 + 2/9
c. 18 x (19191919/21212121 + 88888/99999)
2. Tìm x, biết:
a. 3/5 : x - 4/5 x 3/2 = 1/2
b. 1- (X x 0,5 + X : 4 x 3) : 0,25 = 0,2
