Các câu hỏi tương tự
28+27+26+25+24+23+22+21+20+19+18+17+16+15+14+13+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=?
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=bn
ai nhanh mk tick cho,nhớ kb với mk nha
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
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=?
Tính nhanh :
12+13+14+15+15+16+17+18 =
1+2+3+4+5+6+7+8+9 =
Tính nhanh:
2+4+6+8+10+12+14+16+18=???
1+3+5+7+9+11+13+15+17=???
Tính nhẩm:a)7 + 5 ..... 5 + 7 .....4 + 9 ..... 9 + 4 .....8 + 7 ..... 7 + 8 .....2 + 9 ..... 9 + 2 .....b)16 − 8 ..... 14 − 7 .....11 − 9 ..... 17 − 9 .....12 − 5 ..... 16 − 9 .....13 − 6 ..... 15 − 8 .....
Đọc tiếp
Tính nhẩm:
a)
7 + 5 = ..... 5 + 7 = .....
4 + 9 = ..... 9 + 4 = .....
8 + 7 = ..... 7 + 8 = .....
2 + 9 = ..... 9 + 2 = .....
b)
16 − 8 = ..... 14 − 7 = .....
11 − 9 = ..... 17 − 9 = .....
12 − 5 = ..... 16 − 9 = .....
13 − 6 = ..... 15 − 8 = .....
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=?