because the two number are decimals, their products > 0.5,
so, one of the decimal must be > 0.5, which means d1> 5,
even 0.56X0.78 < 0.5 yet 0.56+0.78 > 1
thus, (2) can sure the answer.
D.作者: tongxun 时间: 2002-9-20 23:43
agree with you.
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