People's education printing plate eighth grade mathematics instruction 14. 1.2 function group b: excellent training P 1 18 fourth question answer page.

First of all ... the question of the title ... y= one third. One third is not1/3- ...

According to the picture ... three stages of P-point movement? a-& gt； b？ b-& gt； c？ c->； E

From a to b, because the side length of a square is 1, it is regarded as a triangle with AP as the base. So the triangle height is 1?

Is this area an ape? ( 1)= 1/2? *? x？ *? 1= 1/2x

When b arrives at c, the picture is sauce purple. ..

So what? S triangle ape (2) = = s trapezoid? Abce-s triangle ABP-s triangle PCE

S△APE(2)=[( 1/2+ 1)？ *? 1? *? 1/2? ]? - ? [ 1? *(x- 1)？ * 1/2]-? [(2-x)？ *? 1/2? *? 1/2]? === 1/4

-1/4x If...p on CE ... image ... sauce purple.

Is it PE at the bottom? Is the height 1 S△? APE(3)==？ 1*? (5/2-x)？ *? 1/2? ==5/4 - 1/2x

Three areas were found .. Let three areas be equal to 1/3 respectively.

Solve ... s？ Ape (1) =1/3x (1) = 2/3 Two thirds are between 0~ 1 ... It meets the problem.

? s？ ape(2)= 1/3 x(2)==？ - 1/3? Negative one third ... not between 1~2? Do not match? refuse ...

? s？ ape(3)= 1/3 x(3)== x==2/3？ Two thirds are not between 2 and 2.5? refuse ...

When y = 1/3 ...? X=2/3 (two thirds ...)?

? If you don't understand, you can keep it a secret. Don't spray if you don't like it ... if you are wrong, you can keep it a secret. .....

World of Warcraft will never say that it will never give you a collective answer. ....