b: 1ha=0,01km2
a: \(=\dfrac{7}{27}+\dfrac{7}{57}=\dfrac{196}{513}\)
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tính nhanh
17/19+27/35-17/19+1
1/3x 4/5 + 1/3 x 6/5 +2/3
4/7 x 2/9 + 4/7 x 7/9 + 2/3
19 và 5/8 : 7/12 - 15 và 1/4 : 7/12
* 19 và 5/8 là hỗn số *
a) 3 x X x 2/3 = 4/5
b) 3,94 x 18,24 + 18,24 x 3,72 + 18,24 x 2,34
c) 8/9 + 14/27 + 1/9 + 13/27
d) 8/19 x 2/7 + 8/19 x 1/7 + 8/19 x 4/7
3/7 + 4/5 + 4/7
3/2 x 4/5 x 2/3
4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
315/316 x 316 /314 x 316/315 x 317/313
a,
x-2/3-2/15-2/35-2/63=1/9
b
(x+1
3)+(x+1/9)+(x+1/27)+(x+1/81)=56/81
c,
(1/3*5+1/5*7+1/7*9+.....+1/19*21)*x=9/7
d,3+5+7+...+2015/2+4+6+...+2016+x=1
e,2/6+2/12+2/20+...+2/x*(x+1)=2013/2015
Đố bn viết thuộc bảng nhân 19 :
19 x 1 =
19 x 2 =
19 x 3 =
19 x 4 =
19 x 5 =
19 x 6 =
19 x 7 =
19 x 8 =
19 x 9 =
19 x 10 =
(1/3*5+1/5*7+1/7*9+.....+1/19*21)*x=7/9
7/4 - x . 3/4 = 5/19
x : 5/4 = 5/19
[ x + 3/4 ] . 5/7 = 10/9
12/5 : x + 4/3 = 3 2/3
x. 4/5 : 2 = 6/7
x + 20/11.13 + 20/13.15 + 20/15 . 17 + ... + 20/53.55 = 2/4
x : 9/5 = 1/2
8/3 :x = 1/2
9/14 - 2/5 : 4/5
15/13 * 12/19 + 15/13 * 7/9
47/30 : 5/7 - 17/30 * 5/7
\(\dfrac{7}{19}\) x \(\dfrac{1}{3}\) + \(\dfrac{7}{19}\)x \(\dfrac{2}{3}\)
tính
a) 1 1/6 + 1 4/9 =
b) 2 3/4 : 1 3/19 =
c) ( 4 1/5 - 2 3/10 ) x 2 1/2 =
d) 3 3/7 : 6 1/2 x 1 2/5 =