11+12-1=22
1+9+10-2-3=15
11+11+11-19=14
Đúng 1
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Các câu hỏi tương tự
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=?
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+11/12+12/13+13/14+14/15=?
25 tháng 3 2022 lúc 9:31
Bài 3 : Tính
a) 11/7 + 3/5 , 4 + 1/9 b) 21/5 - 5/8 , 2 - 11/15
c) 3/19 x 38/9 , 21/5 x 2 c) 7/3 : 4/9 , 12/7 : 3
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+...100=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+.....+99999999999956214 (tính tỏng)
1+2-3-4+5+6-7-8+9+10-11-12+13+14-15-16+17+18-19-20...+301+302
21 / 11 - 9 / 19 - 3 / 19 - 6 / 19 + 12/11
>,<,=
a,2/3+3/4+4/5+7/9+9/11...................5
b,1/10+1/11+1/12+1/13+1/14...............1/5
c,15/5+13/11+22/21..................5
Tính nhanh:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19