7×7×7=6 3, and only 1 and 2 are single digits. Since 3 is 1, 7 is 2 2× 2× 2 = 8, that is, 7 → 2 6 → 8.
(7+8+3) × 9 = 39 It is known that 7, 8 and 3 are 2, 0 and 1 respectively. What about 3×? = 1? Then it is obviously 5, which means 9→5.
3× 3 = 3 means 1× 1= 1, so 3→ 1.
So: (1) 0× 2 = 0 (2) 2× 2× 2 = 8 (3) (2+0+1) × 5 =15 (4)/kloc-0 /×1.
Question 2: Is there anything wrong with 2. 1 of the title?
( 1+ 1.2)+(2+ 1.2*2)+(3+ 1.2*3)+...+(99+ 1.2*99)+( 100+ 1.2* 100)
=( 1+2+3+...+99+ 100)+ 1.2*( 1+2+3+...+99+ 100)
=( 1+ 1.2)*( 1+2+3+...+99+ 100)
=2.2*5050
= 1 1 1 10
The third question: Three people share 8/3 fish, and the guests eat 7/3 fish of A and 1 3 fish of B, so A is worth1yuan of 7 yuan and B.
The fourth question:
Suppose the specified date is x days,
If 240 meters are paved every day, the whole paving process will be delayed by 5 days, that is, the total distance is 240*(x+5).
If 300 meters are paved every day, the whole paving process can be advanced by two days, that is, the total distance is 300*(x-2).
That is, 240*(x+5)=300*(x-2)
→x=30
The total distance is 240*(x+5)=8400.
Then 8400/30=280 should be paved every day.