5/9 x 3/10 : 7/12
= 1/6 : 7/12
= 1/6 x 12/7
= 2/7
\(\frac{5}{9}\)x\(\frac{3}{10}\): \(\frac{7}{12}\)
= \(\frac{1}{6}\): \(\frac{7}{12}\)
= \(\frac{2}{7}\)
X+ 5/9=9/5 5/12-X=1/3 1/5+X=7/12 X -7/12 =5/4
2/3*X=4/9 X*3/5=7/10 2/5:X=3/10 X:2/5=3/10
cho so a2008b.Hay tim cac chu so thay cho a va b de duoc so chia het cho ca 2,3,5 va 9
Tính :
5/9 x 12/7 =
6/5 : 8/3 =
9/20 x 5/12 =
15/16 : 25/24 =
14 x 5/21 =
10 : 5/3 =
5/3 : 10 =
3/5 + 3/10 =
11/12 - 3/4 =
2/7 x 3/4 =
8/9 -2/9 : 2/7 =
tìm X biết :
a.2/3 : 5/7 : x/9 = 2/7 : 3/5 :10/9
b.3/5 : 7/x : 3/4 = 12/105
c.x : 1/2 = 2/3 x 4/5 x 3/4 x 15/8
Tính nhanh
( 24 x 5 - 12 x 10) x ( 1+2+3+4+5+6+7+8+9)
30 x 25 x 7 x 8/ 75 x 8 x 12 x 14
Mẫu : Ta có: 5 x 6 x 7 x 9 = 5 x 6 x 7 x 9 = 5/6
12 7 x 27 6 x 2 x 7 x 9 x 3
a) 3 x 4 x 7 =
12 x 8 x 9
b)4 x 5 x 6 =
12 x 10 x 8
c)5 x 6 x 7=
12 x 14 x 15
Ai nhanh nhất TiCk ChO !
1:tính bằng cách thuận tiện nhất:
a)54 x 113 + 45 x 113 + 113 b)3/7 + 4/9 + 8/14 + 10/18
2:tính giá trị biểu thức
a)9/5 - 1/2 + 1/3
b)12/9 x 1/12 + 1/6 x 12/9
c)3/4 x (5/6 + 2/3)
d)3/2 - 2/3 : 2
2/3 + 3/4
9/4 + 3/5
5/24 + 1/4
3/15 - 5/35 18/27 - 2/6 37/12 - 3
11/9 x 3/22 7/13 x 13/7 4 x6/7
2/5 : 3/10 3/8 : 9/4 8/21 : 4/7
đúng ghi Đ sai ghi S
a,5/9+2/3=7/12 b,5/9+2/3=7/27
c, 5/9+2/3=11/9 d, 5/9+2/3=10/12
