Math (20點!!!)_0－oob73zj92b的部落格

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Math (20點!!!)

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詳細d~1. (+14)(-3)-(-56)/(+7)2. [(-16)-(-8)]/[(+14)-(-18)]3. [7-(-3)]-(-8)4. 4-(6-12)5. (-5)+[10-(-9)]6. [(-3)+(-5)-(-4)]-(-3)7. (+2)+(-4.5)-(-6.5)8.a diver first dived into a position of 20 m below sea level,then moved up 10 m,and finally dived 60 m downwards.express the final... 顯示更多詳細d~ 1. (+14)(-3)-(-56)/(+7) 2. [(-16)-(-8)]/[(+14)-(-18)] 3. [7-(-3)]-(-8) 4. 4-(6-12) 5. (-5)+[10-(-9)] 6. [(-3)+(-5)-(-4)]-(-3) 7. (+2)+(-4.5)-(-6.5) 8.a diver first dived into a position of 20 m below sea level,then moved up 10 m,and finally dived 60 m downwards.express the final location of the diver in positive or negative number. 9.ken went 6 floors up by a lift from basement 3 and then went 4 floors down.which floor did he reach? 10.the temperature of city a wae -3。c yesterday morning. a. if the temperature of city b was 2。c lower than that of city a yesterday morning,find the temperature of city c yesterday morning. b. at noon yesterday,the temperature of city b went up by 10。c.if the temperature of the two cities were the same at that time,find the temperature of city a at noon yesterday. c. in the evening,the temperature of city b was -8。c.to compare with the temperature in the morning,what is the change in temperature ?

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最佳解答:

你好～～～以下都是敝人的一些意見，如有錯誤請多多指教～～ 1. (+14)(-3)-(-56)/(+7) = (-42) - (-8) = (-42) + 8 = -34 2. [(-16)-(-8)]/[(+14)-(-18)] = (-16 + 8) / (14 + 18) = (-8) / 32 = -(1 / 4) 3. [7-(-3)]-(-8) = (7 + 3) + 8 = 18 4. 4-(6-12) = 4 - (-6) = 4 + 6 = 10 5. (-5)+[10-(-9)] = (-5) + (10 + 9) = 19 - 5 = 14 6. [(-3)+(-5)-(-4)]-(-3) = [(-3) + (-5) + 4] + 3 = -3 - 5 + 4 + 3 = -1 7. (+2)+(-4.5)-(-6.5) = 2 - 4.5 + 6.5 = 4 8.a diver first dived into a position of 20 m below sea level,then moved up 10 m,and finally dived 60 m downwards.express the final location of the diver in positive or negative number. Sol: First, the diver dived into 20m below = -20m moved up 10m = + 10m dived 60m downwards = -60m The final location = -20 + 10 - 60 m = -70m 9.ken went 6 floors up by a lift from basement 3 and then went 4 floors down.which floor did he reach? Sol: Original floor = -3(basement means 地下室) Went 6 floors up = +6 Went 4 floors down = -4 The floor he reached = -3 + 6 - 4 = -1 10.the temperature of city a was -3。c yesterday morning. a. if the temperature of city b was 2。c lower than that of city a yesterday morning,find the temperature of city b yesterday morning. Sol: Original temperature : -3。C 2。C lower than that of city a yesterday morning = -2。C Yesterday morning's temperture = -3 -+ 2 。C = -5。C b. at noon yesterday,the temperature of city b went up by 10。c.if the temperature of the two cities were the same at that time,find the temperature of city a at noon yesterday. Sol: The city b's temperature in the morning yesterday = -5。C Went up by 10。C = +10。C The temperature of city a is equal to that of city b = -5。C + 10。C = 5。C c. in the evening,the temperature of city b was -8。c.to compare with the temperature in the morning,what is the change in temperature ? The temperature in the morning = -5。C The temperature in the evening = -8。C The change in temperature = -8 - (-5) 。C = -8 + 5 。C = -3。C 希望以上答案可以幫到你～～～～～

其他解答:

1.(+14)(-3)-(-56)/7 =42-(-8) =42+8 =50,, 2. [(-16)-(-8)]/[(+14)-(-18)] =(-16+8)/(+14+18) =(-8)/32 =1.1875 or 19/16 3. [7-(-3)]-(-8) =(7+3)+8 =10+8 =18 4. 4-(6-12) =4-(-6) =4+6 =10 5. (-5)+[10-(-9)] =(-5)+(10+9) =(-5)+19 =14 6. [(-3)+(-5)-(-4)]-(-3) =(-3-5+4)+3 =-4+3 =-1 7. (+2)+(-4.5)-(-6.5) =2-4.5+6.5 4