1、2 8 13x6x7x9 6.5y1.5y2.5y18y6.5y6.5y73.5 8x5x47y74y9 8x(2x3)2x5(x7)9 7 9 bbb89 8x2(x8)13(x2)8 8 8 5(x8)7x 5x2(2x8)54(x6)72(x4)92(63.5x) 2(x9)2x 1 1 7(x1)4x5(x2) y72y2 5 5 x2 4x 25 x9.5x9 6 4 x2 2x2 9x6 5(x7)8x 2 4 6a(65a)-5 8b(2b4)42x4(2x6)17 9y4(5y8)24(x4)5(x6) 7x4(x5)8x3 9x1 x0.5x20 3 7 3x3 7x6 8x
2、9(x7) 6 9 2y1 8y6 6 4(23.5y)(1.5y1) 2 8 3y2 2y2 3y8 3 4(x3)6(x4) 4 8 12 3x1 9x7 8x5.5x20 4 7 6x7 5x7 8x5(x5) 6 12 1 8xx17 x3x4x3.5x7x5.5x40644 9x x 5 3x9.5x54.558 8 x8819x x0.5x13x7x6 2x78x27 7 x8x 7x1.5x2x144 4 9x7x8x15 y4y4y49y2.5y1.5y59 6x6x9y74y6 8x(3x6)8x5(x6)1 1 1 83 9x4(x6)54(x7)8 4 2 4(x6)7x
3、 5x4(5x3)25(x4)83(x4)68(37.5x) 5(x8)3x6(x6)6x8(x7) 8y33y3 5 2 x1 1x 65 x2.5x9 4 2 x3 4x4 4x5 2(x8)8x 6 3 7a(22a)-5 4b(4b3)244x3(2x3)15 8y3(3y3)23(x6)5(x5) 4x4(x8)6x5 8x4 6x2.5x13 2 6 3x3 2x5 2x5(x3) 3 9 4y3 5y1 2 3(33y)(3.5y8)7y1 5y6 5y3 5 4(x6)7(x1) 4 6 12 7x5 7x7 4x8.5x13 3 8 5x1 3x7 3x2(x5)4xx58
4、x9x2x17.5x2x16.5x201098 15 5x2.5x53.53x21615x x2.5x8x3x8 x26x63 1 x3x x5.5x9x16x7x3x13 y5.5y10y148y4y8.5y52 9x9x97y57y2 5x(5x2)5x4(x8)5 5 1 81 3x2(x5)25(x9)2 4 2 4(x4)3x 4x4(4x7)35(x8)44(x2)96(78x) 2(x1)5x5(x1)6x2(x2) 9y36y8x3 3x 22 6x9.5x17 x4 4x4 7x4 5(x4)8x 6 5 5a(65a)-4 9b(4b9)235x3(6x2)5 3y4(6y
5、4)94(x2)8(x3) 7x6(x9)9x6 6x8 9x1.5x17 4 6 5x1 3x5 5x3(x5)5y9 7y5 5 4(82y)(2.5y3)3y4 5y4 7y1 4 4(x6)6(x2) 4 8 10 8x2 7x8 5x0.5x75x9 2x6 3x4(x6) 3 12 5 xx39 x9x9 2 x3.5x6x6.5x5676 17 5x5.5x6334 2 3x91717x 5x0.5x8x4x7 4x79x41 3 x4x 6x3x6x152 2 12x4x9x3 1.5y5y8.5y88.5y1.5y2y1010 x6x7y45y2 6x(5x4)3x4(x6)
6、5 3 9 46 7x4(x2)53(x9)8 2 2 4(x1)5x 4x2(6x6)93(x1)23(x7)22(19.5x) 4(x4)8x5(x1)5x2(x6) 2y48y2 2 5 x2 1x 52 4x3.5x16 6 6 x4 2x3 7x4 2(x2)4x8a(17a)5 6b(5b6)13x2(4x7)9 7y4(3y9)83(x6)7(x5) 4x2(x3)4x1 8x5 2x8.5x2 4 8 2x7 8x3 5x2(x5)3y7 4y2 5 6(83.5y)(1.5y1)3y8 4y8 5y9 2 4(x4)8(x6) 2 6 10 9x4 5x2 4x8.5x58x6 5x8 2x3(x3)