专题整式的化简
专题 整式的化简
化简 (1)-a+b-a+b; 1式=(--2)+(b+2=-2x+2b (2)(2x-3)-2(7x); (2)原式=2x-3-14+2x=4x-17 (3)2x-(x-y)+2(x+y); (3)原式=2x-x+y+2x+2y=3x+3y
化简: (1)-a+b- 1 2 a+ 1 2 b; (2)(2x-3)-2(7-x); (3)2x-(x-y)+2(x+y); (1)原式=(-a- 1 2 a)+(b+ 1 2 b)=- 3 2 a+ 3 2 b (2)原式=2x-3-14+2x=4x-17 (3)原式=2x-x+y+2x+2y=3x+3y
(4)-3(2x2-xy)+4(x2+xy-6); (4)原式=-6x2+3xy+4x2+4xy-24=-2x2+7xy-24 (5a+[2a-2-(4-2a)]; (5)原式=a+(2a-2-4+2a)=a+2a-2-4+2a=5a-6 (6)3a-a-2(a-b)]+b; (6)原式=3a-(a-2a+2b)+b=3a-a+2a-2b+b=4a-b
(4)-3(2x2-xy)+4(x2+xy-6); (5)a+[2a-2-(4-2a)]; (6)3a-[a-2(a-b)]+b; (4)原式=-6x2+3xy+4x2+4xy-24=-2x2+7xy-24 (5)原式=a+(2a-2-4+2a)=a+2a-2-4+2a=5a-6 (6)原式=3a-(a-2a+2b)+b=3a-a+2a-2b+b=4a-b
(7)4a2-2(ab-3a2)+3; (7)原式=4a2-2ab+6a2+3=10a2-2ab+3 (8)5(ab-3ab2)-2(a2b-7ab2); (8)原式=5a2b-15ab2-2a2b+14ab2=3a2b-ab2 (9)3(2x2y-xy2)-(4xy2+3xy) (9)原式=6x2y-3x2-4x2-3x2y=3x2y-7xy2
(7)4a2-2(ab-3a2 )+3; (8)5(a2b-3ab2 )-2(a2b-7ab2 ); (9)3(2x2y-xy2 )-(4xy2+3x2y); (7)原式=4a2-2ab+6a2+3=10a2-2ab+3 (8)原式=5a2b-15ab2-2a2b+14ab2=3a2b-ab2 (9)原式=6x2y-3xy2-4xy2-3x2y=3x2y-7xy2
(10)x2y2-2xy-(xy2-2x2y2+3x2y) (10)原式=x2y2-2x2y-xy2+2x2y2-3x2y=3x2y2-5x2y-xy2 (11)(5a2-ab+1)-(-4a2+2ab+1) (11)原式=5a2-ab+1+4a2-2ab-1=9a2-3ab (12)2ab+a2-2a2-(-aab); (12)原式=3ab×30b12 2
(10)x 2 y 2-2x2 y-(xy2-2x2 y 2+3x2 y); (11)(5a2-ab+1)-(-4a2+2ab+1); (12)1 3 ab+ 1 4 a 2- 1 3 a 2-(- 2 3 ab); (10)原式=x 2y 2-2x2y-xy2+2x2y 2-3x2y=3x2y 2-5x2y-xy2 (11)原式=5a2-ab+1+4a2-2ab-1=9a2-3ab (12)原式=1 3 ab+ 1 4 a 2- 1 3 a 2+ 2 3 ab=ab- 1 12a 2
(13)m-{n-2m+[3m-(6m+3n)-5n]} (13)原式=m-[n-2m+(3m-6m-3n-5n=m-[n-2m +3m-6m-3n-5n]=m-n+2m-3m+6m+3n+5n=6m +7n 19,,52 (14 (14)原式=x2+2xy +x2+ 332=6x2+3x1 2
(13)m-{n-2m+[3m-(6m+3n)-5n]}; (14)19 4 x 2+ 5 2 xy- 2 3 y 2-(- 5 4 x 2- 1 6 xy+ 3 4 y 2 ). (13)原式=m-[n-2m+(3m-6m-3n-5n)]=m-[n-2m +3m-6m-3n-5n]=m-n+2m-3m+6m+3n+5n=6m +7n (14)原式=19 4 x 2+ 5 2 xy- 2 3 y 2+ 5 4 x 2+ 1 6 xy- 3 4 y 2=6x2+ 8 3 xy- 17 12y 2