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絕對值   題數(shù)：34
Is |x - y | > |x | - |y | ? (1) y < x (2) xy < 0
If a and b are nonzero numbers on the number line, is 0 between a and b ? (1) The distance between 0 and a is greater than the distance between 0 and b. (2) The sum of the distances between 0 and a and between 0 and b is greater than the distance between 0 and the sum a + b .
Is │x - y│>│x - z│?(1) │y│>│z│(2) x < 0
If y is an integer and y = |x | + x, is y = 0 ?(1) x < 0(2) y < 1
If the symbol △ represents either addition or multiplication, which operation does it represent? (1) a △ b = b △ a for all numbers a and b. (2) a △ ( b – c ) = ( a △ b ) – ( a △ c )for all numbers a, b, and c.
If m and r are two numbers on a number line, what is the value of r ?(1) The distance between r and 0 is 3 times the distance between m and 0 .(2) 12 is halfway between m and r.
If zy < xy < 0, is |x - z | + |x | = |z | ?(1) z < x(2) y > 0
What is the value of|x| ?(1) x=-|x|(2) x2 = 4
Is |x | = y - z ?(1) x + y = z(2) x < 0
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