中一正負數(20)

括號不加你也看懂

a) 3-(7)
=-4
b)-13-7
=-20
c)23-(-17)
= 23+17
= 40
d(-4)-(-7)
=-4+7
= 3
e)24 -6 -15
= 3
f)) -12 -66 -5
= -78 - 5
= - 83
g) 34 +36 -16
= 70 -16
= 54
h) 17 -19 + 15
= -2 +15
= 3
i ) -3+4-5-6
= 1 -5-6
= -12
j ) 6 -13 + 15 +1
= -7 +15+1
= 9

2007-08-31 16:13:48 補充：
重有牙 咪話哥哥 吾教精你e d 甘易既數好易明既姐記住 負負得正 正負得負 負正得負 正正得正加減數姐 加油嚕

A) -4
B) -20
C) 40
D) 3
E) 3
F) -83
G) 54
H) 13
I) -10
J) 9
hope that it can help you

太多人回答了, 所以我不回答答案, 但我要補充:
"負負得正, 正負得負, 負正得負, 正正得正" 這說法是不適用於正負數加減.
e.g.
我有10粒豆, Tom取了3粒, 剩下多少?
=(+10)+(-3)
=10-3
=7(correct anxwer)
但若是"正負得負", 答案是-7(wrong answer), 這是錯的(不用計算也知!)

所以"負負得正, 正負得負, 負正得負, 正正得正" 這說法是適用於正負數乘除.

p.s 這些問題很容易, 你有能力計算出來!!

A)+3-7=-4
B)-13-7=-20
C)+23+17=+40
D)-4+7=+3
E)+24-6-15=+3
F)-12-66-5=-83
G)+34+36-16=+54
H)+17-19+15=+13
I)-3+4-5-6=-10
J)+6-13+15+1=+9

A) (+3)-(+7)
=3-7=4
B) (-13)-(+7)
=(-13)-7=(-20)
C) (+23)-(-17)
=23+17=40
D) (-4)-(-7)
=(-4)+7=3
E) (+24)-(+6)-(+15)
=24-6-15=3
F) (-12)-(+66)-(+5)
=(-12)-66-5=(-83)
G) (+34)-(-36)-(+16)
=34+36-16=56
H) (+17)-(+19)-(-15)
=17-19+15=13
I) (-3)-(-4)+(-5)-(+6)
=(-3)+4-5-6=(-10)
J) (+6)+(-13)-(-15)+(+1)
=6-13+15+1=9

希望可以幫到你

A) (+3)-(+7)=_4
B) (-13)-(+7)=-20
C )(+23)-(-17)=+30
D)(-4)-(-7)=+3
E) (+24)-(+6)-(-15)=+33
F) (-12)-(+66)-(+5)=-49
G) (+34)-(-36)-(+16)+54
H) (+17)-(+19)-(-15)=+13
I) (-3)-(-4)+(-5)-(+6)=-7
J) (+6)+(-13)-(-15)+(+1) =+9

a)(+3)-(+7)=3-7=-4
b)(-13)-(+7)=-13-7=-20
c)(+23)-(-17)=23+17=+40
d)(-4)-(-7)=-4+7=+3
e)(+24)-(+6)-(+15)=+24-6-15=+3
f)(-12)-(+66)-(+5)=-12-66-5=-93
g)(+34)-(-36)-(+16)=34+36-16=+54
h)(+17)-(+19)-(-15)=17-19+15=+13
i)(-3)-(-4)+(-5)-(+6)=-3+4-5-6=-12
j)(+6)+(-13)-(-15)+(+1)=6-13+15+1=+9

A) (+3)-(+7)= - 4

B) (-13)-(+7)= -20

C) (+23)-(-17)= 40

D) (-4)-(-7) = 3

E) (+24)-(+6)-(+15) = 3

F) (-12)-(+66)-(+5) = -83

G) (+34)-(-36)-(+16) = 54

H) (+17)-(+19)-(-15) = 13

I) (-3)-(-4)+(-5)-(+6) = -10

J) (+6)+(-13)-(-15)+(+1) =9

a.-4
b.-20
c.40
d.3
e.3
f.-83
g.54
h.13
i.-10
j.9

a -4
b -20
c 40
d 3
e 3
f -83
g 54
h 13
i -10
j 9