The seventh grade math problem, 85 pages, question 1 1. Come on! Yes, I can.
Alas, love may not die in a broken heart,
There, the most painful sentence is, never.
Broken chapter
Termites' tunnels, their public homes
In all, you plant pine forests, footbridges and tall ferns.
Square of Mathematics 6 in Grade 7 2005 -2004*2006
=2005^2-(2005- 1)*(2005+ 1)
=2005^2-(2005^2- 1)
= 1
So the result is 2008.
Grade 7 Mathematics Volume 1 19 Page 101Answer 10:
Solution: Let 1 angle, 5-angle, 1 coin be x, y, z, and list a ternary linear equation group according to the meaning of the question (only this is an incomplete ternary linear equation group, only one equation group of two equations can be listed, and the answer can be obtained through discussion).
The equations are 0. 1X+0.5Y+Z=7.
X+Y+Z=8
Subtract one from two to get three formulas: 0.9X+0.5Y=8.
Discuss the x value and y value in three formulas. X and y can only be non-negative integers, so the following table can be obtained.
X 0 1 2 3 4 5 ........
y 16 7. 1/0.5 6.2/0.5 5.3/0.5 4.4/0.5 3.5/0.5 = 7 .........
To sum up, X=5 Y=7 Z=3.
Question 1 1
Solution: Let's assume that the uphill is X kilometers, the flat road is Y kilometers, and the downhill is Z kilometers.
Equations:
X+Y+Z=3.3
X/3+Y/4+Z/5=5 1/60
X/5+Y/4+Z/3=53.4/60
No calculation, do it yourself!
Division is indicated by/.
Do it yourself on page 108 of the first volume of seventh grade mathematics.
The seventh item on page 109 of the seventh grade mathematics book published by People's Education Press?
The fourth question (1)CE BC (2) angle CAD angle BAC (3) angle AFC (4) 1/2AF*BC, page 69 of the second volume of seventh grade mathematics.
The seventh grade mathematics evaluation page 12, the answer to the third question, write it yourself.
The second volume of seventh grade mathematics 1 19 answers 1 angle =0. 1 yuan 50 =0.5 yuan.
Solution: Let 1 be X and 5 be Y, then 1 yuan is15-x-Y.
From the meaning of the question, we can get the equation:
{ 0. 1X+0.5Y+( 15-X-Y)= 7
{ 0. 1( 10-X)+0.5( 10-Y)+( 10- 15+X+Y)= 9
Solution:
{X=5
{Y=7
There are three 1 yuan coins.
So: 1 angle 5,5 angle 7, 1 yuan 3.
Look at it!
Seventh grade mathematics supplementary exercise page 69 third question A seven B five.