1.) (3x-y) - (x+2y)
2.) (3x+y-5) - (2x-7y)+(x-2y-3)
3.) (3a)x(4b)xc
4.) (-12)x7+(-19)
5.) 8a x 2b - 9ab
好難ar!!!!唔識計!!!!
2007-07-18 2:34 am
回答 (1)
2007-07-18 2:43 am
✔ 最佳答案
1) ( 3X -y) -( x+2y)= 3x-y-x-2y
=2x - 3y
2) (3x+y-5) - (2x-7y)+(x-2y-3)
= 3x + y - 5 -2x +7y +x -2y -3
=2x +6y - 8
3) 3a x 4b x c
= 12abc
4) (-12)x7+(-19)
= - 84 -19
= -103
5) 8a x 2b - 9ab
= 16ab-9ab
= 7ab
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