h*) (x + 3)(1 – x) > 0
i*) (x2 – 1)(x2 – 4) < 0
k*) (x2 – 20)(x2 – 30) < 0
Bài 4: Tìm các số nguyên x sao cho
a) –3 ⋮ (x – 2)
b) (3x + 7) ⋮ (x – 2)
c*) (x2 + 7x + 2) ⋮ (x + 7)
(x2 + 9) (9x2 -1) = 0
(4x2 -9) (2x-1 -1) =0
( 3x+2) (9-x2 ) =0
(3x+3)2 ( 4x - 42 ) =0
2(x-5) ( x+2) =1
Tim cac so nguyen x,y biet:a)*x2 -3*x+1 chia het cho x+2 b)x2-xy = 5x-4y-9 c) (x2-8)*(x2-15)<0 d) (x+1)2+(y+1)2+(x-y)2=2 e) (x2-4)x2>0 ai lam truoc minh tick,mai minh di hoc rui,lam giup minh di pls Thank ban truoc ne ;(
bài 1 tìm x
a. 5 - 3(x+4) = -1
b.(x-1) - (x+2) = 0
c.( \(\dfrac{1}{2}\) + x )-( \(\dfrac{1}{3}\) - x) = 0
d. 2x2 - 3 = 5
e. x(2x -1) = 0
g. \(\dfrac{1}{3}\) . x2 - \(\dfrac{1}{6}\)=\(\dfrac{7}{6}\)
1 Tính Nhanh
a) (-3/4+2/5):3/4+(3/5+ -1/4):3/7
b) (-2/5 x 0,375 x 94) - [ 0,125 x 3,25 x (-8)]
2 Tìm X
a) 1/3 + 1/2 : x = (-4)
b) | x - 3,5 | + 1 = 7,5
c) | x - 2 | = 6 - x
d) x2 - 2x > 0
x2 là x mũ 2 đấy nhé!
tính hợp lí
(22+21+23+22) x 20x21x22x23
a,x2-2x=0
b,-x2+5x=0
c,x(x-1)>0
d,x.(5+2)>0
e,(x+1).(x-2)>=0
f,(x-3).(5-x)>=0
Tìm x
a) (x−1)+(x−2)+(x−3)+.....+(x−100)=101
b) x+2x+3x+....+100x=1000
c) x+1+2(x+2)+3(x+3)+...+100(x+100)=1012
d) 1+x1 +1+x2 +1+x3 +...+1+x30 =0
e) (1+x1 )(2−x2 )(3−x3 )=0
BẠN NÀO BIẾT PHẦN NÀO THÌ GIÚP MIK NHÉ!
Bài 4. Tìm số nguyên x, biết:
a) (x2 −9)(5x+15) =0 |
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| b) x2 – 8x= 0 |
c) 5+12.(x−1)2 = 53 |
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| d) (x− 5)2 = 36 |
e) (3x+−5)3 = 64 |
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| f) 42x + 24x+3 = 144 |