old jj

gansen

Q: d1 d2 d3 d4 are different,
问： 0.d1d2+0.d3d4>1? （d1 d2 d3 d4 分别代表小数得十分位和百分位，
不是相乘）
1) 四个数里最小的为4
2）0.d1d2 * 0.d3d4 >1/2
A: 【确认】D
第二个条件怎么确认？

andrewcan

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.

tongxun

agree with you.