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Beijing normal university press eighth grade mathematics volume one all textbook exercises answers
It's not particularly standardized, because it's the teacher's homework for the summer vacation.

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.