Qingdao version of mathematics primary school first to sixth grade learned plane graphics To concept, clear, a little more, a piece of A4 paper content

Rectangle, square, circle, isosceles triangle, isosceles triangle, right triangle and trapezoid
If my answer is good, adopt me!

Grandma put 5000 yuan into the bank on a regular basis. The annual interest rate was 3.06%. A year later, grandma went to the bank to withdraw money. The bank deducted 20% interest tax
① How much is the interest tax? After tax, how many yuan does grandma get back?

Interest tax: 5000 * (1 + 3.06%) * 20%
After tax, grandma took back 5000 * (1 + 3.06%) * (1-20%)

（2+1）（22+1）（24+1）（28+1）（216+1）+1=______ ．

The original formula = (2-1) (2 + 1) (22 + 1) (24 + 1) (28 + 1) (216 + 1) + 1 = (22-1) (22 + 1) (24 + 1) (28 + 1) (216 + 1) + 1 = (24-1) (24 + 1) (28 + 1) (216 + 1) + 1 = (28-1) (28 + 1) (216 + 1) + 1 = (216-1) (216 + 1) + 1 = 232-1 + 1 = 232

The different Chinese characters in the following formula represent 2, 4, 6 and 8 respectively
Millennium + Millennium + year = 2000
Welcome = () Millennium = () year = ()

Welcome = (2) thousand = (4) Jubilee = (6) year = (8)
Then you substitute the number and the result is 2000

As shown in the figure, point C is on line AB, AC: BC = 3:2, point m is the midpoint of AB, and point n is the midpoint of BC. If Mn = 3cm, find the length of line ab
fast

Let the length of AB be X
Because point m is the midpoint of ab
So MB = 1 / 2x
Because AC: BC = 3:2, and point n is the midpoint of BC
So NB is 1 / 5x
So 1 / 2x-1 / 5x = 3
The solution is x = 10

Qingdao version of mathematics primary school first to sixth grade learned plane graphics To concept, clear, a little more, a piece of A4 paper content