74.有12个数字,不是偶数,就是可以让5整除,其中又5个可以让2整除,由8个可以让5整除,问多少个可以被10整除?
75.what is the sum of a certain pair if consecutive odd integers?
at least one of the integers is negative
at least one of the integers is positive
ans: c
76.if y is the smallest positive integer such that 3150 multiplied by y is the square of an integer, then y must be:
a.2 b. 3 c.7 d. 4 e. 14
ans: e.14
77.the surface of a certain planet reflects 80 percent of the light that strike it. the clouds around the planet then absorb 40 percent of the reflected light. what percent of the light that strikes the planet is reflected from the surface and passes trough the clouds without being absorbed?
ans: 40%
78.if x1 and y1, is x x^2/1
xy/1
ans: e
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