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Calculation problems of next semester in junior one mathematics
32.52-(6+9.728÷3.2)×2.5 5.x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2 =[x(y+z)-y(x-z)]^2 =(xz+yz)^2 =z^2(x+y)^2 6。 3(a+2)^2+28(a+2)-20 =[3(a+2)-2][(a+2)+ 10]=(3a+4)(a+ 12)7。 (a+b)^2-(b-c)^2+a^2-c^2 =(a+b)^2-c^2+a^2-(b-c)^2 =(a+b+c)(a+b-c)+(a+b-c)(a-b+c)=(a+B- c)(a+b+c+a-b+c)= 2(a+b-c)(a+c)8。 x(x+ 1)(x^2+x- 1)-2 =(x^2+x)(x^2+x- 1)-2 =(x^2+x)^2-(x^2+x)-2 =(x^2+x-2)(x^2+x+ 1)=(x+2)(x- 1)(x^2+x+ 1)9。 9X2 (x-1) 2-3 (x2-x)-56 = 9X2 (x-1) 2-3x (x-1)-56 = [3x (x-) Calculation problem: (/kloc-) 35.x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2 =[x(y+z)-y(x-z)]^2 =(xz+yz)^2 =z^2(x+y)^2 6。 3(a+2)^2+28(a+2)-20 =[3(a+2)-2][(a+2)+ 10]=(3a+4)(a+ 12)7。 (a+b)^2-(b-c)^2+a^2-c^2 =(a+b)^2-c^2+a^2-(b-c)^2 =(a+b+c)(a+b-c)+(a+b-c)(a-b+c)=(a+B- c)(a+b+c+a-b+c)= 2(a+b-c)(a+c)8。 x(x+ 1)(x^2+x- 1)-2 =(x^2+x)(x^2+x- 1)-2 =(x^2+x)^2-(x^2+x)-2 =(x^2+x-2)(x^2+x+ 1)=(x+2)(x- 1)(x^2+x+ 1) 9x^2(x- 1)2-3(x2-x)-56 = 9 x2(x- 1)2-3x(x- 1)-56 =[3x(x- 1)-8][3x(x- 1)+(- 10/3)+(+ 13/3)+( 1 1/3)(2)(-654438)