[計量]PP兩題
192. 18939-!-item-!-187;#058&011984
Of the 75 houses in a certain community, 48 have a patio. How many of the
houses in the community have a swimming pool?
(1) 38 of the houses in the community have a patio but do not have
a swimming pool.
(2) The number of houses in the community that have a patio and
a swimming pool is equal to the number of houses in the community that
have neither a swimming pool nor a patio.
ans:(B)
要如何解,我要用兩條件才能解出來
167. 17541-!-item-!-187;#058&011147
If x is positive, which of the following could be the correct ordering of
X^(-1),2X and X^2
(I) X^2<2X<X^(-1)
(II) X^2<X^(-1)<2X
(III)2X<X^2<X^(-1)
答案是(I)&(II)
但是我只解出來(I)
請問要如何解(II)
謝謝
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