Đáp án:
Giải thích các bước giải:
5)17-{-x-[-x-(-x)]}=-16
<=> 17-[-x-(-x+x)]=-16
<=>17-(-x-0)=-16
<=>17+x=-16
=>x=-33
6)25-{-x+[x+(-x)]}=16
=> 25-[-x+(x-x)]=16
=>25-(-x)=16
=>25+x=16
=>x=-9
7)x-{[-x+(x-3)]-[(x+3)-(x-2)]}=0
=>x-[(-x+x-3)-(x+3-x+2)]=0
=>x-(-3-5)=0
=>x-8=0
=>x=8
8) x+{(x-3)-[(x+3)-(-x-2)]}=x
=>x+[x-3-(x+3+x+2)]=x
=>x+(x-3-2x-5)=x
=>-x-8=0
=>x=-8
9)-x+821+534=499+x-84
=>821+534-499+84=x+x
=>940=2x
=>x=470