--聽日交-- 各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (4)

a) (+3∕5)+(-1∕5)

=3/5-1/5

=3-1/5

=2/5

(b) (-2∕7)-(+1∕7)

=-2/7-1/7

=-2-1/7

=-3/7

(c) (+1)+(-6)-(-3)

=1-6+3

=-2

(d) (-8)+(+3)-(-6)

=-8+3+6

=1

(e) (-9)-(+3)+(+4)

=-9-3+4

=-8

f) (+5)+(-6)-(+7)
=5-6-7

=-8

g) (-1)+(-4)-(-6)+(+ 9)

=-1-4+6+9

=12

(h) (+3)-(+10)+(-4)-( -2)

=3-10-4+2

=-9

(i) 9.2+(-3)-(+7)-4.1 2

=9.2-3-7-4.12

=-4.92

(j) -16.8-1.5-(21+14)


=-16.8-1.5-21-14

=-19.7

唔好意思,個負號可能細隻左d,要留意呀


樓上個位,計錯左f.g,i.j呀,要留意

a.2/5
b.-3/7
c. -2
d. 1
e.-8
f. -8
g.10
h.-9
i. -4.92
j.-59.3

1.(+3∕5)+(-1∕5)
=3/5-1/5
=(3-1)/5
=2/5//

(b)(-2∕7)-(+1∕7)
=-2/7-1/7
=-(1+2)/7
=-3/7//

(c)(+1)+(-6)-(-3)
=1-6+3
=-2//

(d)(-8)+(+3)-(-6)
=-8+3+6
=-8+9
=1//

(e)(-9)-(+3)+(+4)
=-9-3+4
=-12+4
=-8//

(f)(+5)+(-6)-(+7)
=5-6-7
=5-13
=-7//

(g)(-1)+(-4)-(-6)+(+ 9)
=-1-4+6+9
=12//

(h)(+3)-(+10)+(-4)-( -2)
=3-10-4+2
=5-14
=9//

(i)9.2+(-3)-(+7)-4.1 2
=9.2-3-7-4.12
=0.2-4.12
=-3.92//

(j)-16.8-1.5-(21+14)
=-18.3-35
=-53.3//

a.2/5
b.-3/7
c. -2
d. 1
e.-8
f. -8
g.10
h.-9
i. -4.92
j.-59.3