Tim xthuoc Z biet:
1,|2x-5|-|2x+9|=0
2,|x+1|-|x+2|-|3-x|=7
3,|2x+3|+|3x+2|-|4-x|=10
Tim x \(\in z\);
\(\left(x^2-1\right)\left(x^2-4\right)\left(x^2-7\right)\left(x^2-10\right)<0\)
tim x
a ) x.( x-8) - x.(x+ 1) = 2
b) ( x + 3).5 - 7.(x+9)=0
c 4 ( x - 7) + 7.(x-2)=11
(x^2 -1).(x^2 -4).(x^2 - 7).(x^2 - 10)<0
tim x biet -3x/4.(1/x+2/7)=0
tim x biet (x^2-1)(x^2-3)(x^2-5)(x^2-7)<=0
Tìm x thuộc Z biết (x^2-1)(x^2-4)(x^2-7)(x^2-10) <0
CMR
a, 10^+10^8+10^7 chia het cho 222
b, 81^7-27^9-9^13 chia het cho 45
tim x thuoc Q biet
a,{x+1} {x-2} < 0
b, {x-2} {x + 0,5} nhỏ hơn 0
Tìm số nguyên x sao cho:(x^2-1)(x^2-4)(x^2-7)(x^2-10)<0