简算1 3/21 - 5/23 + 8/21 - 18/23
简算1 3/21 - 5/23 + 8/21 - 18/23
简算:23×21/22+1/22
20除以21/23简算
14/15×(5/14+5/21)×23简算
简算 2又1/17X15-(5又21/23-5又15/17
简算 2又1/17X15-(5又21/23-5又15/17)
23 1 20 3 8 15 21 20
1+2+3+4+5+5+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+
1+2+3+4+5+6+7+8+9+10+11+12+3+14+15+16+17+18+19+20+21+23+24+2
1+1+2+3+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+
1,2,3,4,5,6,7,8,9,1o,11,12,13,14,15,16,17,18,19,20,21,22,23,
1*3+3*5+5*7.+19*21+21*23这是分母分子都是1