即
2.3a+0.4b=5.3 (1)
0.6a-0.5b=0.2 (2)
(1)×5+(2)×4
11.5a+2b+2.4a-2b=26.5+0.8
13.9a=27.3
所以
a=273/139
b=(0.6a-0.2)/0.5=1638/695
即
2.3a+0.4b=5.3 (1)
0.6a-0.5b=0.2 (2)
(1)×5+(2)×4
11.5a+2b+2.4a-2b=26.5+0.8
13.9a=27.3
所以
a=273/139
b=(0.6a-0.2)/0.5=1638/695