\(\dfrac{3}{7}+\dfrac{4}{9}+\dfrac{4}{7}+\dfrac{5}{9}\)
= \(\dfrac{3}{7}+\dfrac{4}{7}+\dfrac{4}{9}+\dfrac{5}{9}\)
= 1 + 1
= 2
1+1+1+1+2+2+2+3+3+3+3+4+4+4+4+5+5+5+5+6+6+6+6+7+7+7+7+8+8+8+8+9+9+9+9+10=
Tính bằng cách thuận tiện
a. 5/7 x 5/9 + 4/9 x 5/7
b. 1/10 + 5/9 + 4/9 + 9/10 – 1
c. 5/7 x 5/9 + 4/9 x 5/7 + 2/7
d. 2/7 + 2/8 + 1/4 + 1/7 + 4/7
e. 4/5 + 3/10 + 2/10 + 0,7
f. 326 x 728 + 326 x 272
a) 1/9 × 4/7 +1/9 × 3/7
b) 5/13 × 189/18 - 5/13× 9/18
c) 12/7 : 4/9 + 9/7 : 4/9
a) ( ( -3/5 + 4/9 ) : 2/7 - (-14/9 + 2/5 ) :2/7 ) : (23/7 x 15/2 - 23/7 x 11/2)
b) ( 8 - 9/4 + 2/7) - (-6 x -3/7 + 5/4 ) - ( 3 + 2/4 - 9/7 )
Mình cảm ơn ! :v
tính nhanh
a, 4/7 x 5/7 + 3/7 x 5/6
b, 5/9 x 1/4 + 4/9 x 3/12
c, 7/9 x 8/5 - 7/9 x 3/5
d, 2006/2005 x 3/4 - 3/4 x 1/2005
1/3 + 5/9 1/9 x 9/3
1/7 - 1/9 1/3 : 1/7
3 : 5/9 9 + 9/3
3 x 5/9 4 - 2/4
1+2+3+4+5+6++7+8+9+9+8+7+6+5+4+3+2+1+1+2+3+4+5++6+7+8+9=?
7/9 + 2/3 - 5/18 =
11/5 - 3/4 + 7/15 =
7/8 + 5/9 : 2 =
4/15 : 2/3 + 5/7 =
Tính nhanh: B = 4/3 + 4/5 - 4/9 trên 7/3 + 7/5 - 7/9
