Các câu hỏi tương tự
Tính tổng:
a)11+13+15+...+147
b)6+8+10+...+1998
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+11/12+12/13+13/14+14/15=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+.....+99999999999956214 (tính tỏng)
Tính nhanh:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
tính nhanh:
8/27 + 4/15 + 19/27 + 11/15
12/13 + 2/7 + 8/13 + 6/13 + 5/7
điền dấu lớn bé = vào chỗ chấm
9/8-5/6 .... 17/27-4/9
6-15/4....3/2+3/4
11/3-[5/3+2/3].....11/3-5/3-2/3
19/13+4/13-10/13....19/13-10/13+4/13
tinh : A=5 + 6+7+8+9+10+11+12+13+14+15
Tính :
2/5 + 11/15 =
7/8 - 7/9 =
11/13 x 26/31 =
16/24 : 4 =
30 : 6/5 =
9/16 : 4 =
1/2 : 1/3 x 8/15 =
3. Tính nhanh:
a, (1+3+5+7+9) - (0+2+4+6+8)=.........................................................................................
b, (11+13+15+17+19) - (10+12+14+16+18)=......................................................