Question

m+2m
a+2a+9a
m²-2m²-7m²
6x²y²-12x²y²+x²y²
3a-2b-5b+9a
a²+b²-2b²-3a²-a²+b²
x²yz+3xy²-2xyz²-3xyz²+xyz²-x²yz

Answer 1

1) m+2m = 3m

2) a+2a+9a = 12a
3) m²-2m²+9a = -m²+9a

4) 6x²y²-12x²y²+x²y² = -5x²y²

5)3a-2b-5b+9a = 12a-7b

6)a²+b²-2b²-3a²-a²+b² = -3a²

7)x²yz+3xy²-2xyz²-3xyz²+xyz²-x²yz = 3xy²-4xyz²