1/5 + 3/12 - 3/4 = 5/60 + 15/60 - 15/60 = 5/60 = 1/12
28/17 x 68/14 = 14x2x17x4/17x14 = 2x4 = 8
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Các câu hỏi tương tự
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+20-1-5-9-3=
1+2+3+4+5+6+....+7+8+9+10-12-13-14-15-16-17-...-18
1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18=?
1+2+3+4+5+6+7+8+9+11+12+13+14+15+16+17+18+19
1+4+3+2+5+7+6+8+9+11+12+13+14+15+16+17+18+19
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=?
Tính: 1+2-3+4-5+6-7+8-9+10-11+12-13+14-15+16-17+18-19+20 = ?