2.( 1) Northeast 55 1000

3.( 1) 170 155

(2)2.9% 2.8%

(3) 10 14

Five. To solve practical problems

1.[ 100÷(5×5)- 150÷( 12×4)]÷[ 150÷( 12×4)]

=[4-3. 125]÷3. 125

=0.28

=28%

A: The information in A magazine is 28% more than that in B magazine.

2.45÷( 1+87.5%)

= 24 (person)

24× 87.5% = 2 1 (person)

A: 24 girls and 2 boys1.

3.6 mm = 0.6 cm

15mm =1.5cm.

3. 14×(0.6÷2)? × 1.5=0.4239cm？

0.4239×2=0.8478cm？

45 ml = 45 cm?

45/0.8478 ≈ 53 days

A: It takes about 53 days.

4.8 1× 90% = 72.9 (yuan)

A: The current price is 72.9 yuan.

5. 1-2/5×2= 1/5 (/ is the fractional line, numerator/denominator)

300×2÷ 1/5=3000 (m)

The total length of this road is 3000 meters.

6.360÷3× 10= 1200 (m)

A: The total length of this road is1200m.

(Question 6: Draw a line segment. 360 is three copies, 360÷3 is one copy, and 5/7 is half of the total length, so the total length is 10, multiplied by 10).

We have done all these topics and approved them, and we are sure that there is no problem. Want to use a bow.