A.(a+3)(a-3)=a2-9 | B.a3+b3=(a+b)(a2-ab+b2) |
C.a2-4a-5=(a-2)2-9 | D.a2-4a-5=a(a-4)-5 |
A.(-1+0.2a)2 | B.(1+0.2a)(1-0.2a) |
C.(0.2a+1)(0.2a-1) | D.(0.04a+1)(0.04a-1) |
A.(-x)2+y2 | B.x2-y2 | C.x2+2xy+y2 | D.x2-2xy+y2 |
A.8x2y-24xy2=8xy(x-3y) |
B.ax+bx+ay+by=x(a+b)+y(a+b) |
C.12x2y+14x2y2-2xy=2xy(6x+7xy-1) |
D.x3-8=(x-2)(x2+2x+4) |
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