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. Correct the error.

Step 2 be positive

positive

Step 4 be positive

Step 5 be positive

fail

7. Counter

Eighth place

9. positive

10 anti