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5.n sweet weigh 15n grams ,how many grams does a packet of 48 sweets weigh???6.the cost of publishing p magazines $(1500+6p)(a)find the cost of publishing 250 magazing(b)hencce ,fing the cost of publishing each magazine in average8.there are 21 blue ballangsome yellow ball in a box .if the percentage of the... 顯示更多 5.n sweet weigh 15n grams ,how many grams does a packet of 48 sweets weigh??? 6.the cost of publishing p magazines $(1500+6p) (a)find the cost of publishing 250 magazing (b)hencce ,fing the cost of publishing each magazine in average 8.there are 21 blue ballangsome yellow ball in a box .if the percentage of the ofyellow balls to total number is 65% ,how many yellow balls are there in the box? 更新: 1.(-7)x(+4)+(-14)=??? 2.(-12)+(-52)/(+4)=??? 3.(-32)/(+4)x(-15)=??? 4.(-8)x(-3)-(-15)=???

最佳解答:

5. A packet of 48 sweets weigh = 15 (48) grams = 720 grams 6. (a) the cost of publishing 250 magazines = $[1500+6(250)] = $(1500+1500) = $3000 (b)the cost of publishing each magazine in average = $3000/250 = $12 8. Number of yellow balls are there in the box = 21(65%)/(1 - 65%) = 21(65%)/35% = 39 1.(-7)x(+4)+(-14) = -28 - 14 = -42 2.(-12)+(-52)/(+4) = -12 + (-13) = -12 - 13 = -25 3.(-32)/(+4)x(-15) = -8 x (-15) = 120 4.(-8)x(-3)-(-15) = 24 - (-15) = 24 + 15 = 39

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