* \(y=\frac{16}{9}\)
* \(y=\frac{13}{5}\)
(k cho tớ với nhá!)
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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:
a) 5 – 4 – 3 – 2 – 1 + 11 + 12 + 13 + 14 + 15
b) 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10 +11
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
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+1+010+11+22+15
1+5=9
1+6=11
1+7=15
1+8=21
hỏi 1+9=... 1+10=...1+11=...
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=?