=86\3÷87

=86\26 1

An engineering team built an expressway. 38m on the first day and 42m on the second day. The next day is 1/28 of the total length of this road. How long is this road? How much was this road built in two days?

(42-38)÷ 1/28= 1 12 (38+42)÷ 1 12=5/7

3. The mall sells two coats at the original price of 1.200 yuan. It is known that one of them earned 1/5 and the other lost 1/5. What are the prices of these two coats now?

1200×( 1+ 1/5)= 1440 1200×( 1- 1/5)=960

There are two frames of fruit. The weight of fruit in frame A is equal to 3/4 of fruit in frame B. What is the weight of fruit in frame B?

4\5

It takes 5 minutes for Party A to make a part, 7 minutes for Party B and 1/4 for Party C to make a part every minute. Among them, (c) has the highest efficiency.

Read a science and technology book, you can finish it every day 1/6, and you can finish it in (3) days 1/2.

When the value of x is equal to (0) or (), x2=6x.

1/30+ 1/42+ 1/56+ 1/72+ 1/90

= 1/30+ 1/90+ 1/42+ 1/56+ 1/72

= 1/ 10