Đáp án: Ta có: $(x-3)(x+3)-(x-3)^{2}= (x-3)(x+3-x+3)=6(x-3)$
Đáp án:
Giải thích các bước giải:
$(x-3).(x+3)-(x-3)^2$
$ = (x-3).(x+3-x+3)$
$ = 6.(x-3)$
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