How does the area of a parallelogram change if the length of each side is increased by 2 times?, Decreased by 4 times., Increased by 2 times., Increased by 4 times., Keeps unchanged., Let n be a positive integer. Suppose that n2+n-3 is divisible by n+1 . What is the value of n?, 4, 2, 3, 1, The sum of 2018 and a 3-digit number is a square number. Find the smallest possible value of the 3- digit numbers., 286, 182, 191, 383, The coefficient x8y3 of in the expansion of (x-y)11, -165, 165, 330, -462, Given real number x ≠ 0 such that x+ 1/x = 2 . The value of expression x3 + 1/x3 is, 2, -2 or 1, 3, 1, The sum of the fractions ... is equal to which of the following fractions:, 0, B, C, D, The opposite fraction ... of is, A, B, C, D, Given expression ... . The condition of x for the value of the expression to be determined is:, x ≠ 2  and x ≠ 4, x ≠ 2, x ≠± 2, x ≠ ± 2 and x ≠ 4, Find the value of x for ..., x> 5/2, x< 5/2, x< -5/2 , x> 5, Given rectangle ABCD, F is any point on side AD, BF intersects CD extended at point E. Connect point A with point E. Knowing AF = 3cm, BC = 5cm, AB = 7 cm then the area of ​​triangle AEF is, 28cm2, 10cm2, 7cm2, 15cm2, Given triangle ABC, M on side BC such that MB:BC = 3:4; N on edge AM. Know that the area of ​​triangle NAB is 14dm2; the area of ​​triangle NMB is 7dm2. Calculate the area of ​​triangle NMC., 7/3 dm2, 21 dm2, 14dm2, 10/3 dm2, The sum of the coefficients of the polynomial f(x)=[1+x9 (x-1)]10 is, 0, -1, 1, 10, Find the value of x so that ... equals 0 ?, x = ± 4., x ≠ 1., x = -4., x = - 1., Find the condition for two fractions ... and ... to be equal, x = 2 , x ≠ 1, x = -2, x = -1, Given two fractions ... and ... . The common denominator of two fractions above is, 15(x-1)(x-2), 15(x-1)2(x-2)2, 15(x-1)(x-2)2, 15(x-1)2(x-2), Which of the following sentences is right, Parallelogram with two diagonals perpendicular is a rhombus., Quadrilateral with two diagonals perpendicular is a rhombus., Rectangle with two diagonals equal is a square., Trapezoid with two legs equal is a parallelogram., Let Q(x)=2x3+ax2+bx+c where a,b,c are given constants. If Q(0)=1; Q(-1)=2; Q(2)=3, the value of a+b+c is equal to, -14/3, 20/3, 4, -2, Câu 19, 25/7, 5, 25/6, 25/12, The coefficient of x2 in the expansion of (1+x)(1+x2)(3+x3)...(7+x7) is equal to, 1, 5040, 2520, 28.

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