1. Take a square with a side length of 1, divide one side into five rectangles, add pink to four of them, divide one side of the square into three rectangles, and color two of them blue. At this time, the graphic area of pink and blue parts accounts for the original rectangular area.

(Fill in a few scores)

Solution: Draw a sketch first. As can be seen from the sketch, the area of the overlapping part =(4/5)*(2/3)=8/ 15 (the problem should mean that two-thirds of the sides are adjacent to two-fifths of the sides, and it should be solved by the rectangular area formula. If the answer is 4/5, then this question is of little significance. In addition, the topic should be a fraction of the original square area at the end)

2. Formula calculation

4.9-2 3/5+3 1/ 10

=4 9/ 10-2 3/5+3 1/ 10

=4 and 9/ 10-2 and 6/ 10+3 and110.

=49/ 10-26/ 10+3 1/ 10

=(49-26+3 1)/ 10

=54/ 10

=5.4

3+3/4* 1.6+5.5÷4+2/5 (all fractions of the same denominator can be converted into decimals according to the above method, and the calculation method is as follows).

=3.75* 1.6+5.5/4.4

=6+ 1.25

=7.25

solve an equation

From 1 1/5x=32/7

x =(32/7)* 5/ 1 1 = 160/77。

If the topic is 1 1/(5x)=32/7.

Then x = (11/5) * 7/32 = 77/160.