Tính nhanh:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
3. Tính nhanh:
a, (1+3+5+7+9) - (0+2+4+6+8)=.........................................................................................
b, (11+13+15+17+19) - (10+12+14+16+18)=......................................................
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=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+.....+99999999999956214 (tính tỏng)
Tính nhanh
19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+2=......?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
ai nhanh mink tick cho
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20= ?
Tính bằng cách thuận tiện nhất nha.
AI NHANH MK TÍCH
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+...100=
