幫我回答下的問題有向數

2007-07-28 5:36 pm

可唔可以幫我回答下的問題:有向數

(1) x-10=-8
(2) 2x+5=-11
(3) 12+3x=-4-5x

回答 (3)

2007-07-28 5:43 pm

✔ 最佳答案

(1) x - 10 = -8
x = -8 + 10
x = 2
(2) 2x + 5 = -11
2x = -11 - 5
2x = -16
x = -16 / 2
x = -8
(3) 12 + 3x = 4 - 5x
3x + 5x = 4 - 12
8x = -8
x = -1

參考: me

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2007-07-28 8:24 pm

1. x-10=-8
x=-8+10
x=2
2.2x+5=-11
2x=-11-5
2x=-16
x=-8
3.12+3x=-4-5x
12+4=-5x-3x
16=-8x
-2=x
x=-2

參考: 自己

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2007-07-28 6:51 pm

(1) x-10= -8
x= -8+10
x= 2

(2) 2x+5= -11
2x= -11-5
2x= -16
x = -16/2
x= -8

(3) 12+3x= -4-5x
3x= -9
x= -9/3
x= -3+12
x= 9

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