раскройте скобки: 1)a+(-3d+2c),2)-x-(-3p-2y),3)-(m-2m)+(-3a+b),4)(x-5)-(7-x)+(9-x)

Question

раскройте скобки: 1)a+(-3d+2c),2)-x-(-3p-2y),3)-(m-2m)+(-3a+b),4)(x-5)-(7-x)+(9-x)

Answer 1

1)a+(-3d+2c)=a-3d+2c

2)-x-(-3p-2y)=-x+3p+2y

3)-(m-2m)+(-3a+b)=-m+2m-3a+b=m-3a+b

4)(x-5)-(7-x)+(9-x)=x-5-7+x+9-x=x-3

 

Answer 2

1)a+(-3d+2c)=a-3d+2c

2)-x-(-3p-2y)=-x+3p+2y

3)-(m-2n)+(-3a+b)=-m+2n-3a+b

4)(x-5)-(7-x)+(9-x)=x-5-7+x+9-x=x-3