(6*5-30)*(19+21+23+25+27+29+31)
= 0 * (19+21+23+25+27+29+31)
= 0
(6*5-30)*(19+21+23+25+27+29+31)
= 0 * (19+21+23+25+27+29+31)
= 0
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.
18+19+20+21+22+23+24+25+26+27+28+29+30=?
Ai nhanh tick cho! Rảnh kb & ib với mk!!!!
Tính nhanh :
11+13+15+17+19+21+23+25+27+29
69339:3=....... 16547:2=......... 86428:4=........ 16547:2=....... 25837:3=......
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+36+37+38+39+40=
tính nhanh: 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=?
(nhớ la phải trình bày ra đó)
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=.................................
A=20+21+22+23+24+25+26+37+28+29+30
1.Viết thành số La Mă sau đây:
13
14
15
16
17
18
19
22
23
24
25
26
27
28
29
30
31
32
33
2. Các kí hiệu số La Mă là chữ nào?