功課 help math...

🎓 學業台小學及中學教育

2007-10-11 8:49 pm

x=6 y=-2

a. 2(x+2)-2y=
b. x二次方-y二次方=

回答 (4)

Jennifer

2007-10-11 8:55 pm

✔ 最佳答案

a) 2(x+2)-2y=
2(6+2)-2(-2)
=2(8)+4
=16+4
=20

b. x二次方-y二次方=
x^2-y^2
=6^2-(-2)^2
=36-4
=32

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十五十六

2007-10-11 9:47 pm

a. 2 x (6 + 2) - 2 x -2
= 2 x 8 - -4
= 16 +4
= 20

b. (6 x 6) - (-2 x -2)
= 36 - 4
= 32

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YUI HONG

2007-10-11 9:26 pm

不要做社會垃圾,功課是要自己做的!!!

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[匿名]

2007-10-11 9:03 pm

2(X+2)-2y=-2
2X(6+2)-2X-2......

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