Tìm n thuộc Z

a, (n+2) chia hết cho n-1

b, 2n+3 chia hết cho n-2

c, n-7 chia hết cho 2n+3

A =\(\dfrac{2n+1}{n-3}\)+ \(\dfrac{3n-5}{n-3}\)- \(\dfrac{4n-5}{n-3}\). tìm giá trị của n để

a, A là 1 ps

b, A là 1 số nguyên

cho a/b = c/d (a.b.c.d khác 0).

chứng minh a/b=a+c/b+d = a-c/b-d

tìm x

CMR : 1/22+1/32+...+1/20132 < 1

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Ai làm đúng và nhanh nhất mình sẽ tick max điểm

trên nửa mặt phẳng có bờ là tia Ox vẽ 2 tia Oy và Om sao cho góc xOy = 1/2 góc xOm vẽ tia phân giác của góc mOx' ( Ox là tia đối của tia Ox

Chỉ trên hình vẽ những tia nào là tia phân giác của góc nào ? Vì sao

Tìm x : \(\dfrac{1}{10}+\dfrac{1}{15}+\dfrac{1}{21}+-+\dfrac{2}{x.\left(x+1\right)}=\dfrac{2010}{2012}\)

Tính nhanh .

a, \(P=\dfrac{\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}}{\dfrac{5}{12}+1-\dfrac{7}{11}}\)

b, \(Q=\dfrac{0,125-\dfrac{1}{5}+\dfrac{1}{7}}{0,375-\dfrac{3}{5}+\dfrac{3}{7}}+\dfrac{\dfrac{1}{2}+\dfrac{1}{3}-0,2}{\dfrac{3}{4}+0,5-\dfrac{3}{10}}\)

A=415-(-726)-|-385|-726

B=(-2) ngũ 4. (-5) ngũ 3.25.13.4

C=52. (-15)-52.85+200

Giúp mk nhé