超容易既中一英數=)`1`2`3`唔睇你走寶(20點)

1) 5abc , -6cba is like terms

2) 7x²y , -yx² is like terms

Simplify the following
1) 4pqr-3qrp-2rpq+7prq
= 6pqr

2) 2x²+3xy+7yx-3y²
= 2x²+10xy-3y²

3) 3x-x²-x+2x²-1+x³
= 2x+x²-1+x³

4) ab-bc+ca-ba+2cb-ca-3ab-ac+bc
= 2cb-ca-3ab

5) xy-2yz+4zx+1-yx-3yz-3+zx-7+yz+2zx-1
= 7zx-4yz-10

6) 3x+4y+5z+7x-y-3z-4x+2y-z
= 6x+5y+z

7) -5-7m+m²-3m+4+m²+6m²-4+2m
= -5-8m+8m²

8) p³-2p+1-p²+4p-2-3+2p-4p²+7³
= p³+4p-5p²+339




hope ican help you~~





Gooood luck!!!

1) like terms
2) like terms

1) 4pqr-3qrp-2rpq+7prq
=4pqr-3pqr-2pqr+7pqr
=(4-3-2+7)pqr
=6pqr

2) 2x²+3xy+7yx-3y²
=2x²+3xy+7xy-3y²
=2x²+10xy-3y²

3) 3x-x²-x+2x²-1+x³
=x³+2x²-x²+3x-x-1
=x³+x²+2x-1

4) ab-bc+ca-ba+2cb-ca-3ab-ac+bc
=ab-3ab-ab-bc+bc+2bc+ca-ca-ca
=-3ab+2bc-ca
=2bc-3ab-ca

5) xy-2yz+4zx+1-yx-3yz-3+zx-7+yz+2zx-1
=xy-xy-2yz-3yz+yz+4zx+zx+2zx+1-3-7-1
=-4yz+7zx-10
=7zx-4yz-10

6) 3x+4y+5z+7x-y-3z-4x+2y-z
=3x+7x-4x+4y-y+2y+5z-3z-z
=6x+5y+z

7) -5-7m+m²-3m+4+m²+6m²-4+2m
=m²+m²+6m²-7m-3m+2m+4-4-5
=8m²-8m-5

8) p³-2p+1-p²+4p-2-3+2p-4p²+7³
=p³-p²-4p²-2p+4p+2p+1-2-3+7³ (7³=343)
=p³-5p²+4p+339