Các câu hỏi tương tự
( 1+2+3+4+5+...+99+100)
hãy tính nhanh:
A.1+2+3+4+5+6+7+8+9+10+11+12+13-14=?
B.30-29+28-27+26-25+24-23+22-21...+12-11+10-9+8-7+6-5+4-3+2-1=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
3+3+4+4+5+51+1+1+1+1+1+1+2+2+2+5+7+8+9x 0 = ?
Tính :
1-2+3-4+....+99-100
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 = .......... = ...........
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+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+10+10+11+......100+100 (Mỗi số hai lần nha !)
Tính nhanh:
a) 5 – 4 – 3 – 2 – 1 + 11 + 12 + 13 + 14 + 15
b) 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10 +11