各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (9)

(a)
(+7) - (-3)(-2) - (+3)(-3)
=7-(6)-(-9)
=7-6+9
=10

(b)
(-8) - (+3)(-2) -(-4)(+5)
=-8-(-6)-(-20)
=-8+6+20
=6+20-8
=18

(c)
(-3) - (-2)(+3) -(-3)(-4)(-5)
=-3-(-6)-(12)(-5)
=-3+6-(-60)
=-3+6+60
=60+6-3
=63

(d)
(-6)+(-1)² × (-5)²
=-6+1×25
=-6+25
=25-6
=19

負負得正 正正得正
負正得負 正負得負

1.a) (+7)-(負負)x(3x2)-(正負)x(3x3)
=(+7) - (+6) - (-9)
=(+7)(負正)x 6 (負負)x 9
=+7-6 +9
=+10


b) (-8)-(正負)x(3x2)-(負正)x(3x3)
=(-8)-(-6)-(-9)
=(-8)(負負)x6(負負)x9
=(-8)+6+9
=+7
c) (-3)-(負正)x(2x3)-(負負)x(3x4)x(-5)
=(-3)-(-6)-(+12)(-5)
=(-3)(負負)x6-(正負)x60
=(-3)+6-(-60)
=(-3)+6(負負)x60
= -3+6+60
=+63

d) (-6)+(-1)(-1)x(-5)(-5)
=(-6)+(負負)x(1x1)x(負負)(5x5)
=-6+1x25
=19

(a) (+7) - (-3)(-2) - (+3)(-3) = 7+3-2+3-3 = 8

(b) (-8) - (+3)(-2) -(-4)(+5) = -8-3 +2+4+5 = 6

(c) (-3) - (-2)(+3) -(-3)(-4)(-5) = -3+2+3+3-4+5 = 6

(d) (-6)+(-1)² × (-5)² = -6-1x(+25 )= -125

.(a)(+7) - (-3)(-2) - (+3)(-3)
(+7)-(+6)-(-6)
=7-6+6
=1


(b)(-8) - (+3)(-2) -(-4)(+5)
(-8)-(-6)-(-20)
(-8)+6+20
=18

(c)(-3) - (-2)(+3) -(-3)(-4)(-5)
(-3)-(-6)-(-60)
=(-3)+6+60
=63

(d)(-6)+(-1)² × (-5)²
=(-6)+1x25
=(-6)+25
=19

2007-09-14 20:48:35 補充：
.(a)(+7) - (-3)(-2) - (+3)(-3)(+7)-(+6)-(-9)=7-6+9=10