tìm x
1) [(3/8.x-1/2):5/7+4/9].6/11=18/55
2) (7/10-3.x):( 1 9/10-1 2/5)+4/5=1
ba p/s nào đc xắp xếp theo số thứ tự từ bé đến lớn ;
a.5/7 ; 9/8 ; 3/5
b. 9/8;5/7;3/5
c. 3/5 ; 5/7 ; 9/8
d.5/7 ; 3/5 ; 9/8
9+8+9+5+7+4+3+5+5+9+8/5=.................................
8/9÷3/7=
8/9+2/5=
7/8-1/3=
3/10×1/6=
b.hỗn số
1 2/7+6 5/6=
5 3/4-1/5 =
6 2/9÷4 7/10=
5/3+3/2-7/6=
(1+2+3+4+5+6+7+8+9)-55=?
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
\(\dfrac{1}{3}+\dfrac{2}{3}=\)
\(\dfrac{4}{5}+\dfrac{5}{6}=\)
\(\dfrac{4}{5}-\dfrac{3}{5}=\)
\(\dfrac{9}{8}-\dfrac{4}{2}=\)
\(\dfrac{8}{5}x\dfrac{5}{8}=\)
\(\dfrac{6}{7}x\dfrac{4}{7}=\)
\(\dfrac{4}{5}:\dfrac{4}{5}=\)
\(\dfrac{5}{5}:\dfrac{5}{5}=\)
a,
5/7 + 6/5 =...............................................
10/9 - 5/6 =................................................
5/8 x 4/3 =...............................................
7/2 : 5/9 =................................................