中一數學問題(急!!)‵‵‵

-2(6)+8(-10)
= -2 x 6 + 8 x (-10)
= 12 + (-80)
= 68#


+(-5)(-7)-(+8)(+4)
= +(-5) x (-7) - 8 x 4
= 35 - 32
= 3#


I hope it can help you!

2009-11-18 21:53:31 補充：
-2(6)+8(-10)
= -2 x 6 + 8 x (-10)
= -12 + (-80)
= -92#

This question's answer is -92.
It is because -2 x 6 = -12 , +8 x (-10) = -80 ,
-12+(-80) = -92

*(-) x (+) = (-) 負數乘正數=負數
(-) x (-) = (+) 正數乘負數=正數
Those are important. You should remember them.

2009-11-18 22:21:03 補充：
-2(6)+8(-10)
= -2 x 6 + 8 x (-10)
= -12 + (-80)
= -92#

This question's answer is 92.
It is because -2 x 6 = -12 , (+8) x (-10) = -80
-12 + (-80) = -92

* (-) x (-) = (+) 負數乘負數 = 正數
(+) x (-) = (-) 正數乘負數 = 負數
(+) x (+) = (+) 正數乘正數 = 正數

2009-11-18 22:36:37 補充：
* (-) / (-) = (+)
(-) / (+) = (-)
(+) / (+) = (+)

(-) + (-) = (-)
(-) + (+) = (-) or (+)
eg. -1+2 =1 , -2+1= -1
(+) + (+) = (+)

2009-11-18 22:37:49 補充：
*(-) - (-) = (+) or (-) eg. -1-(-2)=1 , -10-(-9)= -1
(-) - (+) = (-)
(+) - (+) = (+) or (-) eg. 2-1=1 , 1-2= -1

Those are important. You should remember.

-2(6)+8(-10)
= -12+(-18)
= -12-18
= -30

+(-5)(-7)-(+8)(+4)
= (+1)(+35)-(+32)
= (+35)-32
= 35-32
= 3

-12-80
=-92


35-32
=3

-2(6)+8(-10)
=(-2X6)+(8X-10)
=-12+(-80)
=-12-80(because+ - = -)
=-92

2.+(-5)(-7)-(+8)(+4)
=(-5X-7)-(8X4)
=35-32
=3
希望幫到你:]

1.-2(6)+8(-10)
=-12-80
=-92
2.+(-5)(-7)-(+8)(+4)
=35-36
=-1

1.- 2X(6)+8(-10)=-12-80
=-92

2.+(-5)(-7)-(+8)-(+4)
=35-12
=23

比我二十點～

-2(6)+8(-10)
=-(2x6)+((8x10))