1+2+3+4+5+6+7+8+9+10=55
55-(12+13+14+15+16+17+18)= -50
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1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20-1-5-9-3=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=?
x = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 .
x = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 .
x = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 .
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21=?
Tính: 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)*(21*4+6-84)=???...???
1 tháng 11 2016 lúc 20:45
20-19+18-17+16-15+14-13+12-11+10-9+8-7+6-5+4-3+2-1=
Tính:
1 + 2 - 3 + 4 - 5 + 6 - 7 + 8 - 9 + 10 - 11 + 12 - 13 + 14 - 15 + 16 - 17 + 18 - 19 + 20