GMAT数学求解
问题描述：
GMAT数学求解
If x, y, z areinteger and xy+z is an odd integer, is x an even integer?
1)xy+xz is an even integer
2)y+xz is an odd integer
答
1）yes
2）not sure因为x为奇数时y,z可一奇数一偶数
偶数时yz全为奇数均是可能情况