A.(-5)2000 | B.(-5)2001 | C.-5×(-5)2001 | D.-4×(-5)2000 |
A.(x+xy)(x-xy) | B.x(x2-y2) | C.x(x-y)2 | D.x(x-y)(x+y) |
A.(2x-4)2 | B.2(x-4)2 | C.2(x-2)2 | D.2(x+2)2 |
A.1-9x2=(1+3x)(1-3x) | B.a2-a+
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C.-mx+my=-m(x+y) | D.ax-ay-bx+by=(x-y)(a-b) |
A.0 | B.-3 | C.3 | D.
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