2. Total ***x hours, rest for one hour, that is, the driving time is (x- 1) hours, and S=vt=8*(x- 1)=8x-8.

3. Is this question interesting ... right angle. The ratio of three sides is about 3:4:5.

4.2/5×4 represents the sum of four 2/5 additions.

4×2/5 is to divide 4 into 5 parts and take two of them. I wonder if you said so. ...

5/8÷3/7 means 5/8 MINUS 3/7, and the number of consecutive reductions when you get 0 is the same as above. ...

5. 1 =60 points,1/4 = 60 *1/4 =15 points, so it is 4: 00 15 points.

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Sum of 7 16 6.59

7.7 16 MINUS 59, the subtraction number is 0.

8. If you ask how to calculate it, say it separately.

35= 18: () written in fractional form, that is, 18/? =35. So? = 18/35

Similarly, 35=? /20 So? =20*35=700

So /25=35? =25*35=875

/40=35. So? =35*40= 1400

Finally, I don't understand ...

9.0.4 decimeter = 4cm length: width = 6: 4 = 3: 2 ratio is 1.5.