2. Make a ring on the equator of the globe with iron wire. Now the hoop radius is increased by 1m, and it is necessary to add m meters of iron wire. Suppose there is an iron hoop on the equator of the earth, and the same radius increases by 1m, so it is necessary to add n meters of iron wire. What is the relationship between m and n?
3.a+2=b-2=2(c)=200 1, a+b+c=200 1k, what is the value of k?
4. (Page 4) If x2+x- 1=0, find x3+2x2+3=
5. (6) What is the last digit of 2204+72004?
6. (7) The relationship between1516 and 33 13 is
The power of 13 of 33: according to the proportional method, the power of 16 of 15 is less than that of 16 (the power of 2 is 64), and the power of 13 of 33 is greater than that of/kloc-32.
7.(8) Solve the equation about x: (x-2)|x|-2= 1.
8.( 1 1) Given x2+x= 1, find x4+2x3-x2-2x+2005=
9. Assuming that A, B, X and Y satisfy A+B = X+Y = 2 and AX+BY = 5, then (a2+B2)xy+ab(x2+y2)= 1
10. If both a and b are positive numbers, it satisfies12345 = (11+a) (11-b).
1 1. If (a+b)2-(a-b)2=4, it must be true.
A.a is the reciprocal of b.b.a is the reciprocal of-b.c.a is the reciprocal of b.d.a is the reciprocal of-b.
12. If m2=n+2, n2=m+2, m≠n, the value of m3-2mn+n3 is
Solution: m2-n2=-(m-n)
m+n=- 1
Original formula =mm2-2mn+nn2
=m(n+2)-2mn+n(m+2)
=2(m+n)
=-2
12. If (y( 1)-y)=7, then y2+y2( 1) is equal to.
13. Cut the 20cm iron wire into two sections, and make each section square. If the area difference between two squares is equal to 2.5cm2, find the length of two pieces of iron wire.
14. if a and b are rational numbers and 2a2-2ab+b2+4a+4=0, then a2b+ab2=
15.2003200 12+200320032 - 2(200320022)=
16. Given that A-B = B-C = 5 (3) and A2+B2+C2 = 1, the value of ab+bc+ca is equal to.
17 ... It is known that any number X holds when 4x2-3x+1= a (x-1) 2+b (x-1)+c, then 4a+2b+c=
18. Given that A and B satisfy the equation X = A2+B2+20 and Y = 4 (2b-a), the relationship between X and Y is
19. If x2+3x- 1=0, then x3+5x2+5x+ 18=