Question

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1. (7x²-5x+3)-(7x²-5)=

2. (3x+1)+(-3x²-3x+1)=

3. (a+3b)+(3a-3b)=

4. a²-5ab-b²-(a²+b²)=

5. (x+y-z)-(x-y)+(x-y+z)=

Answer 1

Ответ:

1. 7х²-5х+3-7х²+5 = -5х+8

2. 3х+1-3х²-3х+1 = -3х²+2

3. а+3b+3a-3b = 4a

4. a²-5ab-b²-a²-b² = -5ab-2b²

5. x+y-z-x+y+x-y+z = x+y

Answer 2

(7x²-5x+3)-(7x²-5)= 7x²-5x+3-7x²+5= 8-5x

(3x+1)+(-3x²-3x+1)=3x+1-3x²-3x+1=2-3x²

(a+3b)+(3a-3b)=a+3b+3a-3b=4a

a²-5ab-b²-(a²+b²)=a²-5ab-b²-a²-b²=-2b²-5ab

(x+y-z)-(x-y)+(x-y+z)=x+y-z-x+y+x-y+z= x+y