各位知識朋友 , 入黎幫我手 ar !!! ( P6升F1-數學暑期作業 ) (11)

1.(a)(+5)+(-7)
=5-7
=-2
(b)(-7)+(-9)
=-7-9
=-16
(c)(-7)-(-12)
=-7+12
5
(d)(+5)-(-3)
=5+3
=8
(e)(-3)X(+9)
=-3X9
=-27
(f)(-7)X(-6)
=-7X(-6)
=42
(g)(-3)÷(+6)
=-3÷6
=-1/2or-0.5
(h)(-5)÷(-15)
=-5÷(-15)
=1/3or0.33
(i)(+13)÷(-39)
=13)÷(-39)
=-1/3or-0.33

要計算下面題目，必須懂得以下知識︰
＋＋＝＋
＋－＝－
－＋＝－
－ －＝＋
中一數學課程會詳細教。

所以…
(a) (+5)+(-7)
= 5 – 7
= -2
(b) (-7)+(-9)
= -7 -9
= -16
(c) (-7)-(-12)
= -7 + 12
= 5
(d) (+5)-(-3)
= 5+3
= 8
(e) 到(i) 題，可先當整數計，然後再看符號
(e) (-3)×(+9)
= - 27
(f) (-7)×(-6)
= 42
(g) (-3)÷(+6)
= - 0.5
(h) (-5)÷(-15)
=1/3
(i)(+13)÷(-39)
= -1/3

１a) 5-7=-2
b) -7-9=-16
c)-7+12=5
d)5+3=8
e) -3x9=-27
f)7x6=42
g)-2
h)3
i)-3

(a) (+5)+(-7)
= (+ 5) - (7)
= -2

(b) (-7)+(-9)
= (-7) - 9
= -16

(c) (-7)-(-12)
= (-7) + 12
= 5

(d) (+5)-(-3)
= (+5) + 3
= 8

(e) (-3)×(+9)
= -27

(f) (-7)×(-6)
= 42

(g) (-3)÷(+6)
= -0.5

h 同 i 都係計到 0.3333333....
其實你係吳係搞錯左?
g, h 同 i 其實係吳係:

(g) (+6)÷(-3)
(h) (-15)÷(-5)
(i) (-39)÷(+13)

如果係架話, 咁就係咁:
(g) (+6)÷(-3)
= -2

(h) (-15)÷(-5)
= 3

(i) (-39)÷(+13)
= -3