(a+1.8a)*75=a*1.2b+1.8a*b 怎么得出b?
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(a+1.8a)*75=a*1.2b+1.8a*b 怎么得出b?
(a+1.8a)*75=a*1.2b+1.8a*b
75a+135a=1.2ab+1.8ab
210a=3ab 当a不等于0时
b=70
(a+1.8a)*75=a*1.2b+1.8a*b 怎么得出b?
(a+1.8a)*75=a*1.2b+1.8a*b
75a+135a=1.2ab+1.8ab
210a=3ab 当a不等于0时
b=70