各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (7)

1.(a) -24 / (-3 x -2)
= -24 / 6
= -4

(b)(+28)÷(+4)×(-7)
= (28 x -7) / 4
= -49

(c)(-6)×(-1∕2)÷(-1∕3)
= (-6)×(-1∕2)x(3 / -1)
= (-6 x 3) / 2
= -9

(d)(+7)÷(-7∕2)÷(-2∕3)
=(+7)x(2 / -7)x(3 ∕-2)
=3 / (-1 x -1)
= 3

(e)(-1∕2)÷(+2)×(+4)
=(-1∕2)x(1 / 2)×(+4)
= -1

(f)(-5)÷(-1∕3)÷(+3∕4)×(-2)
=(-5)x(-3)x(+4∕3)×(-2)
=-5 x -1 x 4 x -2
= -40

.(a) .(-24)÷(-3)÷(-2)
=8÷(-2)
= -4
(b) (+28)÷(+4)×(-7)
=7×(-7)
= -49
(c) (-6)×(-1∕2)÷(-1∕3)
=3÷(-1∕3)
= -9
(d) (+7)÷(-7∕2)÷(-2∕3)
= -2÷(-2∕3)
=-3
(e) (-1∕2)÷(+2)×(+4)
= -1/4×(+4)
= -1
f) (-5)÷(-1∕3)÷(+3∕4)×(-2)
= -15÷(+3∕4)×(-2)
= -15÷(-2/3)
=22/2/1

(a).(-24)÷(-3)÷(-2)
=8 / (-2)
= -4

(b)(+28)÷(+4)×(-7)
= 7 ×(-7)
= -49

(c)(-6)×(-1∕2)÷(-1∕3)
= 3÷(-1∕3)
= -9

(d)(+7)÷(-7∕2)÷(-2∕3)
= -2÷(-2∕3)
= 3

(e)(-1∕2)÷(+2)×(+4)
= -1/4x4
= -1

(f)(-5)÷(-1∕3)÷(+3∕4)×(-2)
=15 / (-2/3)
= -10

2007-09-14 19:43:13 補充：
(f)(-5)÷(-1∕3)÷(+3∕4)×(-2) =15 / (-2/3)= -10 唔係 -10..唔好意思...係(-5)÷(-1∕3)÷(+3∕4)×(-2) =15*(4/3)×(-2) = -40