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式の展開

1. 次の式を展開しなさい

(1) x(x+3) (2) 3(x-1) (3) 2x(x-y) (4) (3x2+9x)÷3x (5) 12(4x-12) (6)  2 3x (9x2+12x) (7) (x+1)(x+2) (8) (x-2)(x+4) (9) (x-3)(x-5) (10) (x+4)(x-4) (11) (x+3)2 (12) (x-1)2 (13) (x+3)(x+8) (14) (x+4)(x-1) (15) (x-5)(x-9) (16) (x-11)(x+11) (17) (x+5)2 (18) (x-7)2 (19) (x+a)2 (20) (x-a)2 (21) (x+a)(x-a)

(1) x2+3x (2) 3x-3 (3) 2x2-2xy (4) x+3 (5) 2x-6 (6) 6x+8 (7) x2+3x+2 (8) x2+2x-8 (9) x2-8x+15 (10) x2-16 (11) x2+6x+9 (12) x2-2x+1 (13) x2+11x+24 (14) x2+3x-4 (15) x2-14x+45 (16) x2-121 (17) x2+10x+25 (18) x2-14x+49 (19) x2+2ax+a2 (20) x2-2ax+a2 (21) x2-a2

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