254. 某人存100元,单利r percent,问2年的利息多少?
257. ds: x*y的运算定义为x+y-xy, 有运算r*s, is rs=0?
(1) r+s-rs=0 (2) r=s
254. 某人存100元,单利r percent,问2年的利息多少?
100*2*r%=2r元
257. ds: x*y的运算定义为x+y-xy, 有运算r*s, is rs=0?
(1) r+s-rs=0 (2) r=s
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