21/2*11/3
=\(\frac{21\cdot11}{2\cdot3}\)=77/2
OK
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Các câu hỏi tương tự
bài 1:
1/4 + 2/3 2/7 + 2/3 2/5 + 1/3 2/3 + 1/2 1/3 + 3/5 4/5 + 1/3
1/8 + 3/4 1/36 + 5/12 1/3 + 1/6 + 1/18.
bài 2:
15/16 - 3/16 17/18 - 5/6 3/4 - 4/9 1/2 - 2/5 5/6 - 3/10 3-1/3
4/5 - 1/10 5/2 - 1 5/8 - 2/5.
Các phân số 1/3: 1/6: 5/2: 3/2 xếp theo thứ tự tăng dần
a. 1/3; 1/6; 5/2; 3/2 b. 1/3; 5/2; 1/6; 3/2 c. 1/6; 1/3; 3/2; 5/2 d. 1/6; 3/2; 3/2; 5/2
2/3+5/2-3/4=
2/5*1/2/1/3=
2/9/2/9/1/2=
4/5-1/2+1/3=
1/2*1/3+1/4=
2/7/2/3-1/7=
2/3+5/2-3/4=
4/5-1/2+1/3=
2/5×1/2:1/3=
1/2×1/3+1/4=
2/9:2/9×1/2=
2/7:2/3-1/7=
2)tính :
a)2/5*1/2:1/3;b)2/9:2/3*1/3;c)1/2*1/3+1/4;d)2/7:2/3-1/7
Các phân số : 1/4; 3/2; 1/3 được xếp theo thứ tự từ lớn đến bé là :
a.1/3; 3/2; 1/4;
b.3/2; 1/3; 1/4;
c.1/3; 1/4; 3/2;
d.1/4; 1/3; 3/2
1 A=1 1/2+1 1/3
2 C=2 2/3nhân5 1/4
3 B=2 2/3-1 4/7
4 D=3 1/3 chia 2 1/4
Tính Nhanh
a) ( 1/2 + 1/3 + 1/4 + 1/5 + 1/6 ) - ( 1/2 + 1/3 + 1/4 + 1/5 )
b) ( 2/3 + 2/4 + 2/5 + 2/6 + 2/7 ) - ( 2/4 + 2/5 + 2/6 + 2/7 + 28 )
Evaluate: (1/1 + 2) + (1/1 + 2 + 3) + (1/1 + 2 + 3 + 4) + ... + (1/1 + 2 + 3 + ... + 50)
1/2 -1/3 =
1/2 +1/3=
1/2 nhân 1/3=
1/2 : 1/3=