10 - x + 48 = 40 - 2 + x
=>58-40 +2 = x - (-x )
=>20 = 2x
=>x=10
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10 - x + 48 = 40 - 2 + x
=>58-40 +2 = x - (-x )
=>20 = 2x
=>x=10
Tim x thuoc Z: (x+1)+(x+2)+(x+3)+...+(x+40)=1000
TIm x thuoc Z
38 + 48 : x =32 . 6
Tim x, y thuoc Z biet : | x + 45 - 40 | + | y + 10 - 11 | nho hon hoac bang 0
1 )Tim x, y thuoc Z
x + y = x.y
2) Tim x thuoc Z
(x + 1)+(x+3)+(x+5)+...+(x+99)=0(x-3)+(x-2)+(x-1)+...+10+11=11-12(x-5)+7(3-x)=530(x+2)-6(x-5)-24x=100Tim x thuoc Z
(x-3)+(x-2)+(x-1)+...+10+11=11
tim x thuoc Z thoa man : (x^2 - 20)(x^2-15)(x^2 - 10)(x^2 - 5 )<0
Tim x thuoc Z
a}[x+1]+[x+2]+[x+3]+...............+[x+99]=0
b}[x-3]+[x-2]+[x-1]+.................+10+11=11
tim x thuoc z
(x3+5)(x2+10)(x2+15)(x3+30)
Tim x thuoc Z biet:
a,(10 - x)^2 / 3+3= -9
b,|x-6| *7-(-2)^2= -8+39