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Decomposition of Cross Multiplication Factor of Mathematics in Junior High School Entrance Examination 21212312327
3 1.=(3ab-2xy)(ab-5xy)

32.=y^2(4x^2-5x^2-9)=y^2(4x^2-9)(x^2+ 1)=y^2(2x-3)(2x+3)(x^2+ 1)

33.=(2n+5)(2n-3)

34.=(2l+5)(3l-7)

35.=( 10x-y)(x-2y)

36.=(2m-3n)(4m-5n)

37.=(x^2+5x)^2+(x^2+5x)- 12=(x^2+5x+4)(x^2+5x-3)=(x+ 1)(x+4)(x^2+5x-3)

38.=(x^2+x-2)(x^2+x- 12)+24=(x^2+x)^2- 14(x^2+x)+48=(x^2+x-6)(x^2+x-8)=(x^2+x-8)(x-2)(x+3)