超容易既中一英數=)`1`2`3`唔睇你走寶(20點)

1.Like terms
2.Like terms

Simplification
1. 4pqr-3qrp-2rpq+7prq
=pqr(4-3-2+7)
=6pqr
2. 2x²+3xy+7yx-3y²
=2x²+xy(3+7)-3y²
=2x²+10xy-3y²
3. 3x-x²-x+2x²-1+x³
=x³+x²(2-1)+x(3-1)-1
=x³+x²+2x-1
4. ab-bc+ca-ba+2cb-ca-3ab-ac+bc
=ab(1-1-3)+bc(-1+2+1)+ac(1-1-1)
=-3ab+2bc-1ac
5. xy-2yz+4zx+1-yx-3yz-3+zx-7+yz+2zx-1
=xy(1-1)+yz(-2-3+1)+xz(4+1+2)-1+1
=7xz-4yz
6. 3x+4y+5z+7x-y-3z-4x+2y-z
=x(3+7-4)+y(4-1+2)+z(5-3-1)
=6x+5y+z
7. -5-7m+m²-3m+4+m²+6m²-4+2m
=m²(1+1+6)+m(-7-3+2)-5+4
=8m²-8m-1
8. p³-2p+1-p²+4p-2-3+2p-4p²+7³
=p³(1+7)+p²(-1-4)+p(-2+4+2)+1-2-3+343
=8p³-5p²+4p+339

1. 4pqr-3qrp-2rpq+7prq
=pqr(4-3-2+7)
=6pqr
2. 2x²+3xy+7yx-3y²
=2x²+xy(3+7)-3y²
=2x²+10xy-3y²
3. 3x-x²-x+2x²-1+x³
=x³+x²(2-1)+x(3-1)-1
=x³+x²+2x-1
4. ab-bc+ca-ba+2cb-ca-3ab-ac+bc
=ab(1-1-3)+bc(-1+2+1)+ac(1-1-1)
=-3ab+2bc-1ac
5. xy-2yz+4zx+1-yx-3yz-3+zx-7+yz+2zx-1
=xy(1-1)+yz(-2-3+1)+xz(4+1+2)-1+1
=7xz-4yz
6. 3x+4y+5z+7x-y-3z-4x+2y-z
=x(3+7-4)+y(4-1+2)+z(5-3-1)
=6x+5y+z
7. -5-7m+m²-3m+4+m²+6m²-4+2m
=m²(1+1+6)+m(-7-3+2)-5+4
=8m²-8m-1
8. p³-2p+1-p²+4p-2-3+2p-4p²+7³
=p³(1+7)+p²(-1-4)+p(-2+4+2)+1-2-3+343
=8p³-5p²+4p+339


i hope my answer will be halp you!!!~

A
1) LIKE TERM
2) LIKE TERM
B
1) 6pqr
2) x(2x+3y)+y(7x-3y)
3) x^3+x^2+2x-1
4) 2cb-ca-3ab
5) 7zx-10
6) z+6x+5y
7) -5-8m+8m
8) p-5p+4p+247

咁亂既..邊個出架??看來係like term既exercise黎.



2009-08-10 13:39:17 補充：
7)-5
8)係2p+339

2009-08-10 13:41:23 補充：
我知發生咩事喇....原來我本來個答案係冇錯,只係漏左2次,三次果D
8)p^3-5p^2+4p+339
7)-5-8m-8m^2
點解會咁亂..