3 / 14 times 1.5-25 / 7 divided by 0.12

3 / 14 times 1.5-25 / 7 divided by 0.12

3 / 14x1.5-25 / 7 divided by 0.12
=3 / 14x3 / 2-25 / 7 divided by 3 / 25
=9/28-3/7
=-3/28

Who can solve an applied problem?
The fruit shop brought in a batch of watermelons, which accounted for 40% of the total sales on the first day and 140 kg on the second day. The weight ratio of the remaining watermelons to the sales was 1:3. How many kg does this batch of watermelons weigh?

400kg
Let the total weight be a kg
The weight ratio of the rest to the sale is 1:3
Then the total amount sold should account for 75% of the total weight
Should have sold 40% on the first day
Then the next day should sell 75% - 40% = 35%
35%a=140
a=400

It can be best solved by proportion
1. The length of a rectangle measured on a scale of 1:5000 is 5cm. It is known that the actual area of the rectangle is 25000 square meters. How many meters is the actual width of the rectangle?
2. A village plans to build 1500 meters of roads, and 340 meters have been built in five days. According to this calculation, how many meters of roads have not been built in 14 days?
(it can be best solved by proportion,

1. Let the actual length of a rectangle be x cm
1: 5000 = 5:x, solution x = 25000 (CM) =250 (m)
25000 △ 250 = 100 (m)
2. I repaired x meters in 14 days
340:5 = x:14, solution x = 952 (m) 1500-952 = 548 (m)

Several calculation problems (write out the process of solving problems)
1.（6a²－7a²+36a³）÷3a²
2.（－8a⁴b∧5c÷4ab∧5）×（a³b²）

1.（6a²－7a²+36a³）÷3a²
=6-7/3+12a
=11/3+12a
2.（－8a⁴b∧5c÷4ab∧5）×（a³b²）
=-8a^7b^7c/4ab^5
=-2a^6b^2c