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1. If a = two-thirds of B, and a is not equal to 2, then A-B + 1 of a + B-5 is equal to? 2. Given 1 / X-1 / y = 3, then the value of the algebraic formula x-2xy-y 2x-14xy-2y is?
3 / 5 of the first question
Question 2 4
Given that the random variable x can only take - 1,0,1,2, and the corresponding probabilities are 1 / 2C, 3 / 4C, 5 / 8C, 7 / 16C, then p {x}
How does B & nbsp; & nbsp; & nbsp; & nbsp; C work out
Because the random variable can only take these four values, so the sum of the probabilities of taking these four values of the random variable must be 1. From this, we can get the value of C, further get the probability of P {x ≠ 0}, and then get P {x ＜ 1, X ≠ 0}. We can get the result from the formula of conditional probability
Given that half a is equal to five parts B and seven parts C, and a + B + C is not equal to zero, what is the value of 2A + 3b-2c of a + B + C
Let a / 2 = B / 5 = C / 7 = t,
∴a=2t,
b=5t,
c=7t,
（2a+3b-2c)/(a+b+c)
=(4t+15t-14t)/(2t+5t+7t)
=5t/14t
=5/14.
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