Huỳnh Nhật Minh
Giới thiệu về bản thân
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2024-04-16 21:10:55
2x = 7 + x
2x - x = 7
x = 7
b) (x - 3)/5 + (1 + 2x)/3 = 6
3(x - 3)/15 + 5(1 + 2x)/15 = 90
3(x - 3) + 5(1 + 2x) = 90
3x - 9 + 5 + 10x = 90
13x - 4 = 90
13x = 90 + 4
13x = 94
x = 94/13
2023-12-16 11:00:20
a) 3x (x - 1) - 1 + x = 0
3x (x - 1) - (x - 1) = 0
(x - 1)(3x - 1) = 0
=> x - 1 = 0 hoặc 3x - 1 = 0
=> x = 1 hoặc x = 1/3
b) x2 - 9x = 0
x(x - 9) = 0
=> x = 0 hoặc x - 9 = 0
=> x =0 hoặc x = 9
2023-12-16 10:56:53
a) x2 + 25 - 10x = x2 - 10x + 25 = (x)2 - 2 . x . 5 + 52 = (x - 5)2
b) -8y3 + x3 = (-2y)3 + (x)3 = (-2y + x) (4y2 - (-2xy) + x2)
= (-2y + x) (4y2 + 2xy + x2)
2023-12-16 10:53:54
a) (2x + 1)2 = (2x)2 + 2 . 2x . 1 + 12 = 4x2 + 4x + 1
b) (a - b/2)2 = (a)2 - 2 . a . b/2 + (b)2 = a2 - ab + b2