Các câu hỏi tương tự
B=1/3 + 1/3^2 + 1/3^3 + 1/3^4 +....+1/3^8?
Viết thành phép nhân:
4+4+4+4
3+3+3+3+3+3+3+3
3+2+3+2+3+2
1+1+1+1+1
1+1+1+1+1+1+1=?
2+2+2+2+2+2+2=?
3+3+3+3+3+3+3=?
4+4+4+4+4+4+4=?
5+5+5+5+5+5=?
Tính :
\(B=\frac{-1}{3}+\frac{1}{3^2}-\frac{1}{3^3}+...+\frac{1}{3^{50}}-\frac{1}{3^{51}}\)
Tínha)2 × 3 × 1 .......... .........2 × 1 × 3 ......... ..........b)4 × 5 : 1 ........... ..........4 : 1 × 5 ........... ..........c)8 : 4 × 1 ........... ..........8 × 1 : 4 ........... ..........d)12 : 3 : 1 .......... ..........12 : 1 : 3 .......... ...........
Đọc tiếp
Tính
a)
2 × 3 × 1 = .......... = .........
2 × 1 × 3 = ......... = ..........
b)
4 × 5 : 1 = ........... = ..........
4 : 1 × 5 = ........... = ..........
c)
8 : 4 × 1 = ........... = ..........
8 × 1 : 4 = ........... = ..........
d)
12 : 3 : 1 = .......... = ..........
12 : 1 : 3 = .......... = ...........
1+1+1+1+2+2+2+2+3+3+3+3=?
Tính nhẩm :
1 × 2 = .... 1 × 3 = ....
2 × 1 = .... 3 × 1 = ....
2 : 1 = .... 3 : 1 = ....
1 × 4 = .... 1 × 5 = .....
4 × 1 = .... 5 × 1 = ....
4 : 1 = ..... 5 : 1 = .....
1 × 1 = ..... 1 : 1 = .....
1+1+1+1+2+2+2+2+3+3+3+3+4+4+4+4=?
1+1+1+1+2+2+2+2+3+3+3+3+4+4+4+4=?
1+1+1+1+1=?
2+2+2+2+2=?
3+3+3+3+3+3=?
4+4+4+4+4=?
5+5+5+5+5=?