1、X+Y=8 X+Y=180 3X+Y=8 2XY= 5 X=Y10 2X5Y=122X3Y=0 3m5n=0 15X6Y=21 X2Y=3 2m3n=1 16X+9Y=12 Y= X3Y=2 2X3Y=621321 = XY=43 3X4Y=12X4Y2X2Y=7 3(2XY)+4(X 2Y)=3229Y 11. 12.X=2Y5 2(3XY) 3(XY)=192X3U5V=10 XY=3 XYZ=1713. 14. YZ=4 15. YZX=12U10V=4 XZ=5 XY Z=316. 3X23X 17. 18. 2a 14)1(25Xa32 19. 20. 4(x-2) 3(2x+5)
2、215x10X38X+5 3X21. 22. 3X18 13(X 1) 8X45Y60(Y1) 270 12 (X1) 223 24 250Y300(Y1) 1500 X3125X13(X1) X225. 26. 2Y3X 152XXY3 2X3Y1627 28XY1 XY3XY 52729. 30. X4Y5 2XY4102YX 8102YX31 32. XY=8 X2Y 10X+Y=8 XY 1033. 34. X2Y10 X2Y83X5Y6 2X3Y=1235. 36.X4Y15 6X7Y414X3Y84 YX23137. 38.2(X1) Y1110X3Y482XY6 X1339. 4
3、0.X2Y2 2(X1) Y63X5Y8 143)(2YX41. 42.2XY1 6(XY) 4(2XY) 16 X4Y5 XYZ1143. 44. 3XY 18XY43 XZ=245. 0 46. 0231X34247. a52 48. 2-X49. 2X1X 50. 2a34a151. X23 52. 4X253. 2X31 54. 3X 1455. 5X 56. 4(2X3) 62(X2)57. 58. 3(12X) 2(X2) 1243652X2X1X 159. 60. XX231X84X 1 5X42X5 3X4X861. 62.72X63X 2(1X) 43X2X13X 2163.
4、 64. 3X 25X 424365. 2X2 66. 113652X32X0 3X12X167. 68. 25X31123XXY22 3X4Y569. 70. 2XY40 7X9Y 25XY3 Y2X371. 72.3X8Y14 3X2Y82XY5 4X10Y3.673. 74.3X4Y2 15X10Y83X4Y16 22X5Y3.675. 76.5X6Y33 53X2Y8YX3 3St577. .78.7X5Y9 5s2t153X4Y16 4XY131Y279. 80.5X6Y33 23YX2X5Y3 2ab381. 82.4XY3 3ab42x5y3 123yx83. 84.2xy34xy3 3X1Y5 3XY585. 86.5Y13 X5 5Y13X5XY Z124287. 88 X2Y 5Z22X4Y256YXabc 0 X2Y 989. 4a2bc 3 90. YZ 325a5bc 60 2ZX 47XY3291. YZ54 92. X36XYZ6693. 2X8 94. X20 95. X72696. 3X2X1 97. 50 98. 4X3 32X1X 199. X51 100. X84X 1
