2a+b=3,(1),4a-3b=5,(2)解方程kuai
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2a+b=3,(1),4a-3b=5,(2)解方程kuai
2a+b=3,(1),4a-3b=5,(2)解方程
kuai
2a+b=3,(1),4a-3b=5,(2)解方程kuai
2a+b=3 扩大2倍即4a+2b=6(3)
(3)-(2) 得5b=1 b=1/5
带回2a+b=3 a=7/5
a=7/5 b=1/5
a=7/5
b=1/5
6a+3b=9
6a+3b+4a-3b=9+5=14=10a
a=1.4
b=0.2