Bài 1: Tính giá trị của biểu thức sau:
a) A = 4x – ( x +3)2 + ( x+3)(x-3) với x = - 2,4
b) B...
Mathematics, 28.08.2021 14:00 ematthews1058
Bài 1: Tính giá trị của biểu thức sau:
a) A = 4x – ( x +3)2 + ( x+3)(x-3) với x = - 2,4
b) B = ( 3x +4)2 -10x – 9( x - 4)(4+x) với x = -0,1
c) C = ( x + 5)2 - 2 ( x – 6 )( x+ 6) + ( x+2)( x-4) với x =
Bài 2 : Tìm x biết
a) ( 2x +3)2 – 4(x-1)(x+1) = 49
b) (3x -1)2 – (3x -2)2 = 0
Bài 3 : Chứng tỏ rằng:
a) x2 -6x +10 > 0 với mọi x
b) 4x – x2 -5 < 0 với mọi x
Answers: 3
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