入來睇下識唔識先啦!!* ((20分))

1)(-5)+(-6)X(-2)
=(-5)+12
=7

2)(-52)-(+52)除(-4)
=(-52)-(-13)
=-39

3.(+7)-(+9)除(+3)
=7-3
=4

4.(-13)X(+20)除(-5)
=(-13)x(-4)
=52

5.(+27)-(-42)X(+3)
=27-(-126)
=153

6.(+10)+(-8)-(-7)-(-9)
=10-8+7+9
=18

7(-12)X(-12)+(-11)X(-11)
=144+121
=265

8.15X5-3X(2)-2-(1)
=75-6-2-1
=66

應該岩GA LA .. HOPE CAN HELP U ~

1.(-5)+(-6)X(-2)
=(-5)+12
=7

2.(-52)-(+52)除(-4)
=(-52)-(-13)
=39

3.(+7)-(+9)除(+3)
=(+7)-(+3)
=4.

4.(-13)X(+20)除(-5)
=(-260)除(-5)
=52

5.(+27)-(-42)X(+3)
=(+27)-(-126)
=(-99)

6.(+10)+(-8)-(-7)-(-9)
=(+2)-(-7)-(-9)
=(+9)-(-9)
=18

7.(-12)X(-12)+(-11)X(-11)
=(+144)+(+121)
=265

8.15X5-3X(2)-2-(1)
=75-6-2-1
=69-2-1
=67-1
=66
.

(1) (--5)+(+12)
=(--5)+12
=+7

(2) (--52)--(--13)
=(--52)+13
= --39

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

(4) (--260)除(--5)
=+52

(5) (+27)--(--126)
=(+27)+126
=+153

(6) (+10)--8+7+9
=+2+7+9
=+18

(7) (+144)+(+121)
=+265

(8) 75--6--2--1
=+66

1. (-5)+(-6)X(-2)
= (-5)+ 12
= 12 - 5
=7
2.(-52)-(+52)除(-4)
=(-52) - (-13)
=(-52) + 13
=-39
3.(+7)-(+9)除(+3)
= 7 - 3
=4
4.(-13)X(+20)除(-5)
= (-260) 除(-5)
=51
5.(+27)-(-42)X(+3)
= 27 - (-126)
=153
6.(+10)+(-8)-(-7)-(-9)
= 2 -(-7)-(-9)
= 2 +7 +9
=18
7(-12)X(-12)+(-11)X(-11)
= 144 + 121
=265
8.15X5-3X(2)-2-(1)
= 75 - 6 -2 -1
=66 (<---計吾出68....-_____-",,,系咪本書有問題-0-?)

1.(-5)+(-6)x(-2)
=(-5)+12
=7

2.(-52)-(+52)除(-4)
=(-52)-(-13)
=-39

3.(+7)-(+9)除(+3)
=(+7)-(3)
=4

4.(-13)X(+20)除(-5)
=(-13)X(-4)
=52

5.(+27)-(-42)X(+3)
=(+27)-(-126)
=153

6.(+10)+(-8)-(-7)-(-9)
=(-18)-(-7)-(-9)
=(-11)-(-9)
=-2

7(-12)X(-12)+(-11)X(-11)
=144+121
=265

8.15X5-3X(2)-2-(1)
=75-6-2-1
=66

在表示數字的正負值時, 除了答案和特別情外, 加上正號是多餘的。
1)(-5)+(-6)*(-2)
=(-5)+12
=12 - 5
=7

2)(-52)-(52)/(-4)
=(-52)-(-13)
= - 52+13
= - 39

3) 7-9/3
=7 - 3
=4

4)(-13)*(20)/(-5)
=(-13)*(-4)
=52

5)(27) - (-42)*3
=27 - (-126)
=27+126
=153

6) 10+(-8) - (-7) - (-9)
=10 - 8 + 7 + 9
=18

7) (-12)*(-12)+(-11)*(-11)
=144+121
=365

8) 15*5 - 3*2 - 2 - 1
=75 - 6 - 2 - 1
=75 - 9
=64
第8條可能係你抄錯題目,否則便是答案錯

2007-09-30 19:10:08 補充：
8條錯左,係66先正確

1. (-5)+(-6)X(-2)=23√

2.(-52)-(+52)除(-4)=-56√

3.(+7)-(+9)除(+3)=89√

4.(-13)X(+20)除(-5)=25√

5.(+27)-(-42)X(+3)=129√

6.(+10)+(-8)-(-7)-(-9)=148√

7(-12)X(-12)+(-11)X(-11)=195√

8.15X5-3X(2)-2-(1)=68√

1. (-5)+(-6)X(-2)=
= - 5 + 12
= 7

2.(-52)-(+52)除(-4)=
= - 52 - (-13)
= - 52 + 13
= - 39

3.(+7)-(+9)除(+3)=
= 7 - 3
= 4

4.(-13)X(+20)除(-5)=
= - 13 * ( - 4)
= 52

5.(+27)-(-42)X(+3)=
= 27 - (-126)
= 153

6.(+10)+(-8)-(-7)-(-9)=
= 2+7+9
= 18

7(-12)X(-12)+(-11)X(-11)=
= 144 + 121
= 265

8.15X5-3X(2)-2-(1)=
= 75 - 6 - 2 - 1
= 68