1、三、解下列方程组。 2a8b6 2x5y20 6a b20 4x5y10 7x4y 66 m6b28 7y3x 66 -8m5b12 16 (2) 0.25 ; (3) 12 ; (4) 10-10 289 343 (3) 0.001 ; (4) 1030 4a b2 6x6y17 a6b14 7x8y17 5x3y 155 6m b19 6y9x 155 -3m5b9 36 (2) 0.01 ; (3) 20 ; (4) 10-2 729 (3) 0.216 ; (4) 1021 8a2b15 6x7y19 7a5b17 5x3y20 x7y 80 2m8b19 8y8x 80 -9m4b1
2、9 81 100 125 (2) -9 ; (3) 0.027 ; (4) 109 7a5b4 x8y4 8a7b14 4x9y12 4x9y 120 8m8b9 5y3x 120 -10m3b4 (2) 0.16 ; (3) 7 ; (4) 10-4 216 (2) -6 ; (4) 1015 8a6b1 5x2y6 9a b14 3x7y4 4x2y 43 2m2b0 6y x 43 -7m b22 (2) 0.49 ; (3) 16 ; (4) 10-6 121 (3) 0.008 ; 8a3b3 4x5y20 a6b20 8x8y5 6x7y -5 9m6b13 5y5x -5 -5m
3、8b5 25 (2) 0.04 ; (3) 9 ; (4) 10-20 324 (2) -10 ; (4) 1024 8a6b17 5x6y16 4a7b1 4x3y9 7x3y 47 3m3b9 7y7x 47 -7m4b3 (3) 1 ; 400 (2) -3 ; (3) 0.512 ; 8a8b10 6x2y3 6a2b12 4x5y2 9x7y 47 9m8b24 y2x 47 -9m2b2 49 (3) 10 ; (4) 10-16 196 (4) 1018 27 5a7b12 2x9y18 8a5b5 2x8y13 5x9y 110 6m5b27 8y9x 110 -1m5b18
4、(2) 0.09 ; (4) 103 5a2b13 7x8y5 3a8b19 8x5y17 3x y -3 2m9b5 6y7x -3 -10m5b4 (2) 0.64 ; (3) 28 ; (4) 10-18 (2) -5 ; 4a6b9 2x3y5 7a5b19 7x8y2 9x6y 133 9m b6 9y3x 133 -3m5b28 (4) 1027 a4b13 7x6y17 3a2b3 4x9y14 8x3y -3 7m9b10 y3x -3 -8m9b1 (3) 6 ; 361 (2) -2 ; 3a6b4 6x3y17 4a5b10 5x5y17 9x4y 116 3m b3 8
5、y6x 116 -3m2b17 169 7a6b19 6x6y6 2a6b12 9x2y2 5x y 1 2m2b1 6y6x 1 -6m6b21 (3) 0.729 ; 4a b15 7x4y4 6a9b14 6x6y11 8x3y 46 2m7b14 2y5x 46 -1m4b17 (3) 18 ; 7a9b16 9x4y6 a4b3 7x3y4 3x8y 61 9m6b22 5y2x 61 -2m8b0 (4) 10-14 a2b17 3x8y1 5a4b9 7x6y18 8x7y 64 4m5b11 2y9x 64 -6m2b16 (2) -7 ; 8a2b14 2x7y6 6a6b20 6x9y17 8x9y 14 9m7b5 9y6x 14 -10m4b3 (3) 0.125 ; 7a2b13 6x5y4 2a3b20 2x8y19 7x3y 70 6m5b27 7y9x 70 -9m7b6 (3) 13 ; 7a b5 4x4y9 3a2b19 x5y13 5x9y 145 4m6b20 8y x 145 -6m4b16
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