初二数学练习题32221(国外英语资料).docVIP

初二数学练习题32221(国外英语资料) Life is fight - Coehlo Rienk Math exercises in junior high school Shangyu experimental middle school Yang Jianjuan Fill in the blanks: 1, (X-Y) 2+ (Y-X) 3= (X-Y) 2 2 factoring ab3-a3b= 3, 4a2-12ab+ () = (2a-3b) 2 4 factoring a2b2-a2-b2+1= 5 factoring m2-3m-10= 6, the polynomial a2-ab-3a+3b has one factor, A-3, and the other factor is 7, polynomial a3-3a2+2a by factoring factor, the results contain factor 8. The general steps of factorization of polynomials are: 9, when x, fractions make sense 10, when x, the value of the fraction is positive 11. As shown in Fig., there is a triangle in the picture The angles of the triangles are for angle C 12, if the intersection of the three high lines of the triangle is outside the triangle Department, then the triangle is an angle triangle 13, the length of the two sides of a triangle is 2 and 9, and the third side is odd, and the length of the third side is 14. In isosceles triangle, the length of two sides is 4 and 9, then its circumference is... 15, three degree angles of the triangle is 2:3:4, the triangle Three degree angle 16, as shown in Figure: the ABC, BD, CD / ABC / ACB respectively, the split Line angle BDC=110 degrees, A degrees is proposed Figure 17: ABC = Delta, Delta EFC, AB=EF / ABC= / EFC, Corresponding edges, corresponding angles 18, as shown in figure AO / BAC split, AB=AC, in Figure Congruent with triangles 19, the inverse proposition of equal vertex angle is, The inverse proposition is (true, false) 20, ABC, AB=4, BC=8, BC on the edge of the line AD The range of values is Two, multiple-choice questions 1, the following decomposition, deformation, the correct is () A.ab (a-b), -a (B-A), =-a (B-A) (b+1) B.6 (m+n) 2-2 (m+n) = (2m+n) (3m+n+1) C.3 (Y-X) 2+2 (X-Y) = (Y-X) (3y-3x+2) D.3x (x+y) 2- (x+y) = (x+y) 2 (2x+y) 2, the following polynomial can not be decomposed by the square difference formula is () A. a2b2-1 B.4 - 0.25y4 C.1+a2 D.-x4+1 3. The following polynomial can be decomposed by t