Упростите выражение :
1.a+( - b ) - ( - 2a )
2.-a-(+a)+2b-(-b)
3.-a-(-b)-4a
4.-a-(+3a)+(-b)-b
1.a+( - b ) - ( - 2a )
2.-a-(+a)+2b-(-b)
3.-a-(-b)-4a
4.-a-(+3a)+(-b)-b
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Answers & Comments
2) -2a+3b
3) -5a+b
4) -4a-2b
Удачи :)
2. -a-(+a)+2b-(-b)=-а-а+2b+b=-2а+3b
3. -a-(-b)-4a=-а+b-4а=-5а+b
4. -a-(+3a)+(-b)-b=-а-3а-b-b=-4а-2b