標題:
3條中一數學問題
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發問:
1. 8y-2=2y+34 2. y+3/4y=28 3. John is 4 kg heavier than Mary. If their total weight is 82 kg, find the weight of Mary. Let Mary's weight be y kg. ______________ +_______________=____________________ 以上題目請列式計算，thx!!
最佳解答:
1. 8y-2=2y+34 8y-2y=34+2 6y=36 y=6 2. y+3/4y=28 y+3y/4=28 4(y+3y/4)=112 4y+3y=112 7y=112 y=16 3. John is 4 kg heavier than Mary. If their total weight is 82 kg, find the weight of Mary. Let Mary's weight be y kg. y+4+y=82 2y=82-4 2y=78 y=39 Mary's weight is 39 kg. 希望幫到你:)
其他解答:
8y-2=2y+34 (y+4)+y=82 6y =34+2 2y+4 =82 6y=36 2y=78 y=6# y=39# y+3/4y=28 y+3y/4 =28 4y/4+3y/4=28 7y/4=28 7y=112 y=16#
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