Similar triangles, third grade math exercise.

(1) If PQ//BC is needed, then (30-3x)/4x=30/20, and the solution is x= 10/3.

(2) When S △ BQC and S△ABC are based on CQ and CA respectively, and the heights are equal, CQ/CA= 1/3, CQ= 10.

Let the exercise time be X, x=CQ/3= 10/3, BP=20-4x=20/3=AB/3, S△BPQ? /? S△ABC=BP/AB= 1/3

(3) Let BA=BC, Angle C= Angle A, and let the movement time be X. If △APQ is similar to △CQB, then

In one example, BC/CQ=AQ/AP, 20/3x=(30-3x)/4x, x= 10/9, and AP=40/9.

On the other hand, BC/CQ=AP/AQ, 20/3x=4x/(30-3x), and the solution is x=5 or-10. If negative numbers are removed, x=5 and AP=20, that is, point P coincides with point B..

Fiona Fang experimental primary school is a strong school with characteristics.

What do you want to say to him (her) at this moment?

Math equation problem in the first day of junior high school.

Elementary school math problem: find the area of shadow part (inside)

20 14 mathematics is very difficult

The gap between primary school mathematics and high school mathematics

What is the zeroth power of any number?

Detailed data of linear programming solution

Apple mobile phone is not equal to ≠ how to make a phone call?

When graduate students transfer to another school, they will transfer to the Second Institute of Mathematics after taking the math test 1. Should math scores be converted?