a + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 = 90
a + 9 x 9 = 90
a + 81 = 90
a = 90 - 81
a = 9
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Các câu hỏi tương tự
Tính nhẩm:
6 + 9 ...
30 + 40 ...
7 + 9 ...
80 − 60 ...
8 + 9 ...
50 + 30 ...
9 + 9 ...
90 − 30 ...
300 + 300 ...
15 − 8 ...
600 − 300 ...
16 − 8 ...
700 + 200 ...
17 − 8 ...
900 − 700 ...
18 − 9 ...
Đọc tiếp
Tính nhẩm:
| 6 + 9 = ... | 30 + 40 = ... |
| 7 + 9 = ... | 80 − 60 = ... |
| 8 + 9 = ... | 50 + 30 = ... |
| 9 + 9 = ... | 90 − 30 = ... |
| 300 + 300 = ... | 15 − 8 = ... |
| 600 − 300 = ... | 16 − 8 = ... |
| 700 + 200 = ... | 17 − 8 = ... |
| 900 − 700 = ... | 18 − 9 = ... |
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ai nhanh nhất và chích xac thì mik k
5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+6+5+7+5+8+9+0+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+8+9+8+9+9+9+9+9+9+9+9+9+9+9+100+9000+1000=????
9+9+9+9+9+9+9+9+9+9++99+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9=
9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9
80+90+9/9+50/10=
9*9*9*9*9*9*9*9-9-9-9-9*9*9
9+9+9+9+9+9+9+9+9+9+9