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(3﹣x)(3+x) (x﹣3)(x+3) (3﹣x)2 (3+x)2
00000015 00000017 00000021 00000023
2x+3y=5xy 3x﹣x=3 2x+3x=5x2 ﹣x2﹣x2=﹣2x2
x2+2 x2+3x+2 x2+3x+3 x2+2x+2
3x-2x=1 3x+2x=5x2 3x·2x=6x 3x-2x=x
x2·x3=x6 (x2)3=x8 x2+x3=x5 x6÷x3=x3
2x2-4x2=-2 3x+x=3x2 3x·x=3x2 4x6÷2x2=2x3
2x2+x﹣3 2x2﹣x﹣3 2x2﹣x+3 x2﹣2x﹣3
x+x2=x3 2x+3x=5x (x2)3=x5 x6÷x3=x2
(x+3)(x-2) (-1-3x)(1+3x) (a2+b)(a2-b) (3x+2)(2x-3)