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OG18-数学分册
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For what value of x between –4 and 4, inclusive, is the value of $$ x^{2} – 10x + 16 $$ the greatest?
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If x * y = xy - 2(x + y) for all integers x and y, then 2 * (-3) =
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191020
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It is given that a/(a+b)=5，what is the value of b/(a+b)
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190302
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x=$$\sqrt{3}$$+$$\sqrt{7}$$.x+$$\frac{1}{x}$$=?
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PREP07 Test 1
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If $${M}={4}^{\frac{1}{2}}+{4}^\frac{1}{3}+{4}^\frac{1}{4}$$, then the value of M is
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300难题
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The surface distance between 2 points on the surface of a cube is the length of the shortest path on the surface of the cube that joins the 2 points. If a cube has edges of length 4 centimeters, what is the surface distance, in centimeters, between the lower left vertex on its
front face and the upper right vertex on its back face?
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OG12 OG15 OG16 OG17 OG18
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$$\frac{1}{(0.75-1)}=$$
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OG12
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If the operation ? is defined for all a and b by the equation a?b=$${a}^{2}\frac{b}{3}$$, then 2?[3?(-1)] is
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Magoosh
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If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =
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Magoosh
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2 - [1 - (1 - [2 - 3] - 2) + 3] =
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Magoosh
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When positive integer x is divided by 11, the quotient is y and the remainder is 4. When 2x is divided by 8, the quotient is 3y and the remainder is 2. What is the value of 13y – x ?
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OG19-数学分册
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For what value of x between -4 and 4, inclusive, is the value of $$x^{2} - 10x + 16$$ the greatest?
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Ready4
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For what value of x between -4 and 4, inclusive, is the value of  the greatest?
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190302
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$$x^{2}$$-(m-2)x-$$(n+4)^{2}$$=0 has only one solution. mn=?
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One year ago a window washing service charged $100 for setup and an additional $30 per hour for on-site washing. This year the company charges $20 for setup and an additional $50 per hour for on-site washing. Which of the following is equivalent to the percentage change from last year to this year that the company charges for setup and x hours of on-site washing?
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Ready4
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If  , then  is equal to
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Magoosh
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A bag contains x blue chips and y red chips. If the probability of selecting a red chip at random is $$\frac{3}{7}$$, then $$\frac{x}{y} =$$
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Magoosh
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If square ABCD has area 25, and the area of the larger shaded square is 9 times the area of the smaller shaded square, what is the length of one side of the smaller shaded square?Note: Figure not drawn to scale
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190321
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Circle O is internally tangent to a square ABCD. The radius of circle O is 2m. What is the area of the shaded part of the graph?
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PREP07 Test 1
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Which of the following equations is NOT equivalent to $${4}{x}^{2}={y}^{2}-{9}$$
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