求mathes答案!!!! (5)

2010-08-17 4:39 am

1.*150 balls are put into boxes A and B .IF the number 0f balls in box B is a multiple of that in box A,suggest two pairs of balls in boxes A and B.(p.90)

2.*Jenny wants to send a parcel to her uncle.The postage is 38.2.She has some
$1.4-stamps,$2.5-stamps.Suggest two ways of paying the postage using these
kinds of stamps.(p.90)

3.The first term and the fifth term of a sequence are 1 and 16 respectively.Find
the second,the third and the fourth term of the sequence.

Thanks

回答 (1)

Godfrey

2010-08-17 5:53 am

✔ 最佳答案

1.*150 balls are put into boxes A and B .IF the number 0fballs in box B is a multiple of that in box A,suggest two pairs of balls inboxes A and B.(p.90)x + y = 150x + 2x = 150x = 50, y = 150 – 50 = 100x + 4x = 1505x = 150x = 30, y = 150 – 30 = 12050 balls in box A and 100 balls in box B30 balls in box A and 120 balls in box B
2.*Jenny wants to send a parcel to her uncle.The postage is38.2.She has some$1.4-stamps,$2.5-stamps.Suggest two ways of paying thepostage using these kinds of stamps.(p.90)$2.50 x 8 + $1.40 x 13 = $38.20I only think of one way
3.The first term and the fifth term of a sequence are 1 and16 respectively.Findthe second,the third and the fourth term of the sequence.1, 2, 4, 8, 16The number = the previous number multiply by 21, 1x2, 1x2x2, 1x2x2x2, 1x2x2x2x 2

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