3*-6.2=5836

3*

=58.6

6.2

*

= 1.6

2.

After solving *, the distance is still100km.

400-(60*

40*)= 100

100*

=300

*

=300÷ 100

*

=3

3. b ~ ~ * months have passed (the last sentence of the question)

(50

5*)×2=88

12

2*

= 12

*

=6

A big problem.

1.

counter

straight

straight

Step 2 be positive

positive

Step 4 be positive

Step 5 be positive

fail

7. Counter

Eighth place

9. positive

10 anti

Hope to adopt. Thank you.