數學F1 正負數 (very急!!!!!!!!!) 15點! @ gbu94mz95e的部落格

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數學F1 正負數 (very急!!!!!!!!!) 15點!

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最好答晒啦!! (要列埋式)^^" (15點!)thxA. 求下列各項的值100L的9%=20m的65%=40kg的52%=$5000的0.5%=B(1) 正負1. (+9)+(-4)2. (-3)+(-6)3. (+2)-(-3)4. (-7)-(-4)5. (+4)x(-5)6. (-2)x(-30)7. (+50)÷(-25)8. (-36)÷(-9)9. (-8)-(+4)x(-2)B(2)8. (+4)-(-5)x(+6)9. (-5)+(-72)÷(+9)10.... 顯示更多最好答晒啦!! (要列埋式)^^" (15點!)thx A. 求下列各項的值 100L的9%= 20m的65%= 40kg的52%= $5000的0.5%= B(1) 正負 1. (+9)+(-4) 2. (-3)+(-6) 3. (+2)-(-3) 4. (-7)-(-4) 5. (+4)x(-5) 6. (-2)x(-30) 7. (+50)÷(-25) 8. (-36)÷(-9) 9. (-8)-(+4)x(-2) B(2) 8. (+4)-(-5)x(+6) 9. (-5)+(-72)÷(+9) 10. (+84)÷(-7)x(-12) 11. (+45)÷(-13)x(+26) 12. (-0.64)÷(+8)x(+6) 13. (-4)x(-0.25)+(+3) 14. (-9)+(+13) 15. (-15)x(-8) 16. -8÷(+4) B(3) 17. (+10c)-(-30c) 18. (-2d)+(+5e)-9d 19. (+5f)-(+7g)-5f 20. 2x(-5g)-3x(+4g)

最佳解答:

A. 求下列各項的值 100L的9% = 100L * 9/100 = 9L 20m的65% = 20m * 65/100 = 13m 40kg的52% = 40kg * 52/100 = 20.8kg $5000的0.5% = $5000 * 5/1000 = $5 B(1) 正負 1. (+9)+(-4) = 9-4 = 5 2. (-3)+(-6) = -3-6 = -9 3. (+2)-(-3) = 2+3 = 5 4. (-7)-(-4) = -7+4 = -3 5. (+4)x(-5) = -4x5 = -20 6. (-2)x(-30) = 2x30 = 60 7. (+50)÷(-25) = -50/25 = -2 8. (-36)÷(-9) = 36/9 = 4 9. (-8)-(+4)x(-2) = -8+4x2 = -8+8 = 0 B(2) 8. (+4)-(-5)x(+6) = 4+5x6 = 4+30 = 34 9. (-5)+(-72)÷(+9) = -5-72/9 = -5-8 = -13 10. (+84)÷(-7)x(-12) = 84/7 x 12 = 12 x 12 = 144 11. (+45)÷(-13)x(+26) = - 45/13 x 26 = -5 x 26 = -130 12. (-0.64)÷(+8)x(+6) = -0.64/8 x 6 = -0.64x3/4 = -0.48 13. (-4)x(-0.25)+(+3) = 4x0.25+3 = 1+3 = 4 14. (-9)+(+13) = -9 +13 = 4 15. (-15)x(-8) = 15x8 = 120 16. -8÷(+4) = -8/4 = -2 B(3) 17. (+10c)-(-30c) = 10c+30c = 40c 18. (-2d)+(+5e)-9d = -2d+5e-9d = -11d+5e 19. (+5f)-(+7g)-5f = 5f - 7g - 5f = -7g 20. 2x(-5g)-3x(+4g) = -2x5g-3x4g = -10g-12g = -22g 2010-08-07 22:50:26 補充：對唔同既人當然唔同感覺希望幫到你啦^^

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講真.... 呢d題目太淺.... 對一個普通既學生一d都唔難.....|||||part a. 全部冇得寫step;你禁計數機la` part b (1). 負負/正正得正;正負/負正得負 1. (+9)+(-4) = 9-4 = 5 2. (-3)+(-6) = - 3-6 =- 9 3. (+2)-(-3) = 2+3 = 5 4. (-7)-(-4) = - 7+4 = - 3 先搵左係正定負;跟住先x同÷; 5. (+4)x(-5) = - 4x5 = - 20 6. (-2)x(-30) = 2X30 = 60 7. (+50)÷(-25) = - 50÷25 = - 2 8. (-36)÷(-9) = 36÷9 = 4 先x/÷;後加減; 9. (-8)-(+4)x(-2) = - 8-(-4x2) = -8+8 = 0 13. (-4)x(-0.25)+(+3) = 同上` part B(2). 上面都有;自己計la` 8. (+4)-(-5)x(+6) 9. (-5)+(-72)÷(+9) 搵左正負;再x/÷` 10. (+84)÷(-7)x(-12) = 84÷7x12 =144 11. (+45)÷(-13)x(+26) = 同上` 12. (-0.64)÷(+8)x(+6) = 同上` 呢幾題上面都有` 14. (-9)+(+13) 15. (-15)x(-8) 16. -8÷(+4) part b(3). 17. (+10c)-(-30c) = 10c+30c = 40c 18. (-2d)+(+5e)-9d = - 2d+5e-9d = - 11d+5e 19. (+5f)-(+7g)-5f = 5f-7g-5f = -7g 20. 2x(-5g)-3x(+4g) =10g-12g = - 2g 2010-08-07 18:08:38 補充：其實第20題果個係x定乘??|||||B(1) 正負 1. (+9)+(-4)=9-4=5 2. (-3)+(-6)=-3-6=-9 3. (+2)-(-3)=2+3=5 4. (-7)-(-4)-7+4=-3 5. (+4)x(-5)=-20 6. (-2)x(-30)=60 7. (+50)÷(-25)=-2 8. (-36)÷(-9)=4 9. (-8)-(+4)x(-2)=(-8)-(-8)=-8+8=0 B(2) 8. (+4)-(-5)x(+6)=4-(-30)=4+30=34 9. (-5)+(-72)÷(+9)=(-5)+(-8)=-5-8=-13 10. (+84)÷(-7)x(-12)=84/84=1 11. (+45)÷(-13)x(+26)=-3.46x26=-89.96 12. (-0.64)÷(+8)x(+6)=(-0.64)/48=-0.13 13. (-4)x(-0.25)+(+3)=1+3=4 14. (-9)+(+13)=-9+13=-4 15. (-15)x(-8)=120 16. -8÷(+4)=-4 B(3) 17. (+10c)-(-30c)=10c+30c=40c 18. (-2d)+(+5e)-9d=-2d-9d+5e=-11d+5e 19. (+5f)-(+7g)-5f=5f-5f+7g=7g 20. 2x(-5g)-3x(+4g)=2x-3x-5g+4g=-x-g|||||A1. 100L X 0.09= 9L A2. 20mX 0.65= 13m A3. 40kg x 0.52= 20.8kg A4. $5000x 0.005= $25 B(1) 1. 9-4=5 2. -3-6= -9 3. 2+3-5 4. -7+4=-3 5. (+4)x(-5)=-20 6. (-2)x(-30)=60 7. 50-25=25 8. -36-9=-45 9. (-8)-(+4)x(-2)=-8+8=0 B(2) 8. (+4)-(-5)x(+6)=4+30=34 9. (-5)+(-72)÷(+9)= -5-8=-13 10. (+84)÷(-7)x(-12)= -12X -12= 144 11. (+45)÷(-13)x(+26)= 1170/-13= 90 12. (-0.64)÷(+8)x(+6)= -032 X 6= 1.92 13. (-4)x(-0.25)+(+3)= -1+3= 2 14. (-9)+(+13)=4 15. (-15)x(-8)= 15X8= 120 16. -8÷(+4)= -8/4=2 B(3) 17. (+10c)-(-30c)= 10c+30c=40c 18. (-2d)+(+5e)-9d= (-2d-9d)+5e= -11d+5e 19. (+5f)-(+7g)-5f= (5f-5f)-7g= -7g 20. 2x(-5g)-3x(+4g) = -10g-12g= -22g