Tìm số nguyên x, y biết:
a) (x+ 5).(3x- 12) >0
b) (x3+ 5).(x3 +10).(x3+ 15).(x3+ 30) <0
c) xy= x+ y
d) xy+ 12= x+ y
Tìm x
1. -12.(x-5) + 7.(3-x) = 15
2. 30.(x+2) - 6.(x-5) - 24.x = 100
3. (x+1) + (x+3) + (x+5) + ... + (x+99) = 0
4. (x-3) + (x-2) + (x-1) + ... +10 +11 =11
lam giup minh voi.minh can gap
a) -12 . ( x - 5 ) + 7 .( -x + 3 ) = 5
b) 30 . (x + 2 )- 6 .( x - 5 ) - 24 .x = 100
ai nhanh nhat mk se k.lam on giup minh voi
(x^3 + 5)(x^3+10)(x^3+15)(x^3+30)<0
tim x biet (x^3+5)(x^3+10)(x^3+15)(x^3+30)<0
2, Tìm x \(\in\)Z, biết:(x+5)(3x-12)>0
3, Tìm x \(\in\)Z, biết:(x2+5)(x3+10)(x3+15)(x3+30)<0
giup mk nhanh voi minh can gap lam:tim x thuocZ biet:
10-x-|x+5|=0 va |x-7|+|x+3|=8
tìmx biết:
a)(x+1)+(x+3)+(x+5)+....(x+99)=0
b)(x-3)+(x-2)+(x-1)+...+10+11=11
giup mk voi .mk dang can gấp .
please.