1.数学OG:所有题目刷了两遍,错题刷了三遍。熟悉DS题先看条件1,单独看条件2,最后看1+2,顺序千万不要忘。还有注意:问题是what is the number?得出唯一解才能选。问题是is XX....?答案确定跟题目里说的相反就能选。
简单的题一定一定保证不要错,条件都写出来或者画出来,可能就迎刃而解了。比如:
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.