Pythagorean Theorem Page 5? Classroom practice

Solution: A = 225+400 = 625

B=225-8 1= 144

Solution: disagree? 58 & amp# 178; +46 & amp； # 178; = 74 & amp# 178;

Page 7? Exercise 1. 1

Solution: from Pythagorean theorem, we can get: x &；; # 178; = 6 & amp# 178; +8 & amp； # 178; That is, X &；; # 178; = 100? So x = 10.

From Pythagorean theorem, we can get: y &；; # 178; = 13。 # 178; -5 & amp； # 178; ? That is, y &；; # 178; = 144, so y = 12.

Solution:17&; # 178; - 15 & amp； # 178; =64=8。 # 178; ? 15×8÷2 = 60(cm & amp； # 178; ) that is, the area of this right triangle is 60cm &；; # 178; .

Solution: Option 1: the smallest four squares Option 2: the two squares in the middle.

Solution: Make a high CD on the AB side through point C..

∫△ABC is an isosceles triangle, and CD is AB height.

∴CD divides AB equally (three lines are combined into one)

ab = 6cn，∴AD=DB=3cm.

From Pythagorean theorem, we can get: CD &；; # 178; = 5 & amp# 178; -3 & amp； # 178; = 16? So CD=4cm? So the area of △ABC is12cm&; # 178;

That is, the area of △ABC is12cm&; # 178; .

10 classroom exercises

Solution: from Pythagorean theorem, we can get: mo &；; # 178; = MN & amp# 178; +No² That is, mo &；; # 178; = 30 & amp# 178; +40 & amp； # 178; ? Mo² =2500

So MO=50

From Pythagorean theorem, we can get: OQ &；; # 178; Operational amplifier. # 178; +PQ & amp； # 178; That's OQ &；; # 178; = 50 & amp# 178; + 120。 # 178; So OQ= 130

(50+130) ×100 =180×100 =18000 (ten thousand yuan) = 1.8 (one hundred million yuan)

That is, it is estimated to be 65.438+0.8 billion yuan.

Let's call it a day. It's too difficult to deliver. I guess I finished my summer homework with this effort.

If you have spare money, buy a teaching aid, which is full of answers. I was afraid that the teacher would tear it up or confiscate it, so I bought it for nothing.

This is the answer to the old textbook, don't make a mistake.

You can't understand some symbols because the system was adjusted when I added the answer.