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2、n2) 5 (xy)(st) 2(7bx)6(m5q) 5 4 5m(2m7) 9m(2m8c)(3c6m) 5(7n6)6n 8(8m6)(6m5) 9(ab2a)(2a4b) 16(abc6a)7(2a9abc) 6(xy4z)(xy5z) 5(pqpr)(8pqpr) 5 x 1 x 0.9x0.97.60.5x 3 8 9 4 1 6x9x 3(x7)4(x2)17 3 7 1 4 (3x3)x3 9x2(20x)4 6 5 y1 y1 8 1x0.5(x9)50 2 5 1 2 (34x)(4x3) 9(7x7)13 ()()(5) 25(1)3(2) 3 1 4 ( )( ) 9(
3、15)6(18) 2 6 5 (0.5)(5) (5)432 (1)2523 2 0 27(2)3(2 4 7 6 1 6 4 ( )( ) 11(11)5(20) 6 5 3 (60) (5)343 (1)1463 5 6 (-7)(-10) 3(-18) 7(-8)() 5-2(-1810) (-2)314 6 3 -383(-1)(-5) -1.2(-0.6)(-4.8)7.9 2 1 1 2 3 1 ()() 2.8()(8.3) 5 3 3 5 5 5 (7x9) z8(67a) 2a2(6n4z) (4an)7(2x6a) 7 (168z)z 9(9d6mn2) 8 (ab)(pq) 3(8ax)8(n3q) 3 7 8a(6a9) a(5a4z)(5z5a) 9(4s9)9s 8(6m5)(3m4) 9(ab5a)(2a8b) 5(abc4a)8(3a6abc) 8(xy5z)(xy8z) 5(pqpr)(8pqpr) 7 x 1 x 0.4x0.13.65.4x 6 4 3 7x9x 3(x5)3(x3)6 3 6 1 1 (2x3)x3 7x6(9x)3 9 5 y2 y2 1 4.5x8.5(x8)30 3 5 (34x)(3x4) 3(9x8)17