(1/10+-1/10)+(1/11+-1/11)+(1/12+-1/12)+(-1/13+1/13)+(-1/14+1/14)+(-1/15+1/15)+1/16
=0 + 0 +0 + 0 +0 +0 +1/16
=1/16
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1+[2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17]*0,000001
1+2-3-4+5+6-7-8+9+10-11-12+13+14-15-16+...+301+302
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=?
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a) 1/7+1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/15+1/18+1/22+1/24+1/28+1/33
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+20:15x2
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+.........................50= ?