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標題:
有向數 (8題) F.1 >o
發問:
我唔係好識計,請問可唔可以幫吓我 1. -5(12-2)+(2-36) 2. (-6)(+7)-(-3)(- 4)+(-25) 3. 3(- 4)(3)-5(3-8) 4. [6/10+(- 6)]x[36+7x(- 4)/3 5. [(- 4)-(-1)]/(-5x2+15)x[6-3x(-5)] 6. 0/1-(2/3-1/2)/(-1/5) 7. -1/7[-28-(-56)] 8. [-1/3+1/2-(+1/4)-(-1/5)]X [(1/2)-(-1/4)]
最佳解答:
我唔係好識計,請問可唔可以幫吓我 ----- 負數乘負數 等於 正數 負負得正 負正得負 1. -5(12-2)+(2-36) = (-5)x12 + (-5)x(-2)+2-36 = -60 + 10 + 2 - 36 =-60 + 12 -36 = -60 -24 = - 84 2. (-6)(+7)-(-3)(- 4)+(-25) =-42 -12 - 25 = -54 -25 = - 79 3. 3(- 4)(3)-5(3-8) = 3(-12) - 5(-5) = -36 +25 = - 11 4. [6/10+(- 6)]x[36+7x(- 4)/3 = [6/10 -6 ] x [36 - 28/3] = [3/5 - 6 ] x [36 - 28/3] = [(3-6x5)/5 ] x [36x3/3 - 28 /3] = [(-27)/5] x [108/3 - 28/3] = [-27/5] x [80/3] = (-27x80)/(5x3) =(-27/3)x(80/5) = (-9)x16 =-144 5. [(- 4)-(-1)]/(-5x2+15)x[6-3x(-5)] =[(-4)+1]/(-10+15)x[6+15] = (-3)/5x21 =-63/5 6. 0/1-(2/3-1/2)/(-1/5) = 0 + [(2x2/(3x2) - 1x2/(2x3)]/(1/5) = (4/6-2/6)/(1/5) = (2/6)/(1/5) = 2x1/(6x5) = 2/30 = 1/15 7. -1/7[-28-(-56)] = -[-4-(-8)] = -[-4+8] = -[4] =-4 8. [-1/3+1/2-(+1/4)-(-1/5)]X [(1/2)-(-1/4)] = [-2/6+3/6 -1/4+1/5]x[1/2+1/4] =[1/6-1/4+1/5]x[2/4+1/4] = [1/6-1/4+1/5]x[3/4] = [4/6-1+4/5]x3 =[12/6-3+12/5] =2-3+12/5 =-1+1+7/5 =7/5
其他解答:
1. -5(12-2)+(2-36) =-5(10)+(-34) =-50-34 =-84 2. (-6)(+7)-(-3)(- 4)+(-25) =(-42)-(12)+(-25) =-42-12-25 =-79 3. 3(- 4)(3)-5(3-8) =(-36)-5(-5) =-36+25 =-11 4. [6/10+(- 6)]x[36+7x(- 4)/3 =(-27/5)x(36-28)/3 =(-27/5)x(8)/3 =-72/5 5. [(- 4)-(-1)]/(-5x2+15)x[6-3x(-5)] =(- 4+1)/(-10+15)x[6-(-15)] =(-3)/(5)(21) =(-3)/(105) =-1/35 6. [0/1-(2/3-1/2)]/(-1/5) =[0-(1/6)]/(-1/5) =(-1/6)/(-1/5) =5/6 7. -1/7[-28-(-56)] =-1/7(-28+56) =-1/7(28) =-4 8. [-1/3+1/2-(+1/4)-(-1/5)]X[(1/2)-(-1/4)] =(-1/3+1/2-1/4+1/5)X(1/2+1/4) =(7/60)X(1/8) =7/480
有向數 (8題) F.1 >o
發問:
我唔係好識計,請問可唔可以幫吓我 1. -5(12-2)+(2-36) 2. (-6)(+7)-(-3)(- 4)+(-25) 3. 3(- 4)(3)-5(3-8) 4. [6/10+(- 6)]x[36+7x(- 4)/3 5. [(- 4)-(-1)]/(-5x2+15)x[6-3x(-5)] 6. 0/1-(2/3-1/2)/(-1/5) 7. -1/7[-28-(-56)] 8. [-1/3+1/2-(+1/4)-(-1/5)]X [(1/2)-(-1/4)]
最佳解答:
我唔係好識計,請問可唔可以幫吓我 ----- 負數乘負數 等於 正數 負負得正 負正得負 1. -5(12-2)+(2-36) = (-5)x12 + (-5)x(-2)+2-36 = -60 + 10 + 2 - 36 =-60 + 12 -36 = -60 -24 = - 84 2. (-6)(+7)-(-3)(- 4)+(-25) =-42 -12 - 25 = -54 -25 = - 79 3. 3(- 4)(3)-5(3-8) = 3(-12) - 5(-5) = -36 +25 = - 11 4. [6/10+(- 6)]x[36+7x(- 4)/3 = [6/10 -6 ] x [36 - 28/3] = [3/5 - 6 ] x [36 - 28/3] = [(3-6x5)/5 ] x [36x3/3 - 28 /3] = [(-27)/5] x [108/3 - 28/3] = [-27/5] x [80/3] = (-27x80)/(5x3) =(-27/3)x(80/5) = (-9)x16 =-144 5. [(- 4)-(-1)]/(-5x2+15)x[6-3x(-5)] =[(-4)+1]/(-10+15)x[6+15] = (-3)/5x21 =-63/5 6. 0/1-(2/3-1/2)/(-1/5) = 0 + [(2x2/(3x2) - 1x2/(2x3)]/(1/5) = (4/6-2/6)/(1/5) = (2/6)/(1/5) = 2x1/(6x5) = 2/30 = 1/15 7. -1/7[-28-(-56)] = -[-4-(-8)] = -[-4+8] = -[4] =-4 8. [-1/3+1/2-(+1/4)-(-1/5)]X [(1/2)-(-1/4)] = [-2/6+3/6 -1/4+1/5]x[1/2+1/4] =[1/6-1/4+1/5]x[2/4+1/4] = [1/6-1/4+1/5]x[3/4] = [4/6-1+4/5]x3 =[12/6-3+12/5] =2-3+12/5 =-1+1+7/5 =7/5
其他解答:
1. -5(12-2)+(2-36) =-5(10)+(-34) =-50-34 =-84 2. (-6)(+7)-(-3)(- 4)+(-25) =(-42)-(12)+(-25) =-42-12-25 =-79 3. 3(- 4)(3)-5(3-8) =(-36)-5(-5) =-36+25 =-11 4. [6/10+(- 6)]x[36+7x(- 4)/3 =(-27/5)x(36-28)/3 =(-27/5)x(8)/3 =-72/5 5. [(- 4)-(-1)]/(-5x2+15)x[6-3x(-5)] =(- 4+1)/(-10+15)x[6-(-15)] =(-3)/(5)(21) =(-3)/(105) =-1/35 6. [0/1-(2/3-1/2)]/(-1/5) =[0-(1/6)]/(-1/5) =(-1/6)/(-1/5) =5/6 7. -1/7[-28-(-56)] =-1/7(-28+56) =-1/7(28) =-4 8. [-1/3+1/2-(+1/4)-(-1/5)]X[(1/2)-(-1/4)] =(-1/3+1/2-1/4+1/5)X(1/2+1/4) =(7/60)X(1/8) =7/480
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