102×4.5 7.8×6.9+2.2×6.9

5.6×0.25 8×(20- 1.25)

Second, calculate the following questions.

2.95×5.4 1.43×0.67 (the number shall be kept to two decimal places. )

6.84 ÷ 0.36 ÷ 7.9 ÷ 0.35 (the number is kept to two decimal places. )

Third, solve the following equation.

3x-48 = 72 5.9x-2.4x = 7 x÷2.6 = 0.8

Fourth, fill in the form.

1. In other words, the cyclic decimal 0.72727 ... is ().

Xiaolan has a black rabbit, two of which are three times more than black rabbits. Raise () a white rabbit.

The base of an isosceles triangle is 15cm, the waist is a cm and the height is b cm. The circumference of this triangle is () cm and the area is () cm 2.

The area of parallelogram is 33.6 cm, and its base is 8.4 cm. Its height is () cm.

5. The median of this set of data in the table below is (), and the average is ().

172 146 140 142 140 139 138 143

6.

5. Calculate the area below.

6.( 1) The four knitting machines of Yimei Company knitted 2227m colored rope in 8.5 hours. How many Besty ropes can each knitting machine weave per hour on average?

(2) Yimei Company wants to weave Chinese knots with these colored ropes. Each Chinese knot needs 3.6 meters of colored rope. How many Chinese knots can this batch of colored ropes knit at most?

Seven, two paving teams at the same time from both ends of the construction of 2070 meters road. Team A is 46m a day, and Team B is 44m a day. How many days will it be ready?

8. The number of visitors to the Science and Technology Museum last month reached 6.5438+0.378 million, of which children's audience was 654.38+0.6 times that of adults. How many children and adults visited the Science and Technology Museum last month?

Nine, Xiaoping and Xiaoling play military chess, and decide who will play first by touching playing cards. They chose four playing cards, two of which were hearts and the other two were spades. Put four playing cards, face up, and each person draws a card. If the cards drawn by two people are of the same color, Xiaoping plays chess first; If the colors are different, Xiaoling plays chess first. Please answer the following questions:

(1) The possibility of finding two cards of the same color is ().

(2) The possibility that two cards have different colors is ().

(3) Are the rules of the game fair? ( )。 Thank you for your answers. Are there any application problems?

Your application question is very useful.