展開3
1. 展開しなさい
(1) (x+y-1)2 (2) (x+2)(x+y-3) (3) (x+y+2)(x-y+3) (4) (x-y+5)2
2. 次の式を計算しなさい
(1) (x+2)2-(x+5)(x-3) (2) (x+y-1)(x+y+5)-(x-y)2 (3) (x+5)(x-7)+(x-3)2 (4) (x+1)2+2(x-5)2-(3x+1)(x-5)
3. 次の式を計算しなさい
(1) (x+y+1)2-(x+3)2+(y-1)2 (2) (x+2y-1)2 (3) (x+3)2+(x-1)2-3(x+2)(x-5) (4) (x+1)(x-3)-(x+1)(2x+1)+(3x-2)(2x+2)
1.
(1)x2+2xy+y2-2x-2y+1 (2)x2+xy-x+2y-6 (3)x2-y2+5x+y+6 (4) x2+y2-2xy+10x-10y+25
2.
(1)2x+19 (2)4xy+4x+4y-5 (3)2x2-8x-26 (4)-4x+56
3.
(1)2y2+2xy-4x-7 (2)x2+4y2+4xy-4y-2x+1 (3)-x2+13x+40 (4)5x2-3x-8