Maths~急 - Ans.fyi 參考答案

Maths~急

蔡小琳

2011-01-01 6:32 am

(1) Simplify (64w 7次方) x (-2 w 3次方)ｄｉｖｉｄｅ(4w 2次方)
5P 3次方Q2次方 2Q
(2)Simplify ----------------------- - ------
4 25p2次方
(3) A number of student rent a coach to go for a picnic. If there were 10 students more, each of them would have to pay $30. If there were 8 students less, each of them would have to pay $50. Find the number of students going for the picnic.

(4) John has two kinds of coins: $1 coins and $5 coins. One-half the number of $1 coins is more than the number of $5 coins by 60. If the total value ot the coins is $470, how many $1 coins does John have?

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回答 (1)

ShingMingTony

2011-01-01 8:25 pm

✔ 最佳答案

1. 64w^7 *-2w^3/4w^2 = -32w^8

2. 5p^3q^2/4 - 2q/(25p^2) = 125p^5q^2/100p^2 - 8q/100p^2
= (q (125 p^5 q-8))/(100 p^2)

3.let number of students = x
(x+10)*30 = (x-8)*50
x=35

4. let number of $1 coins = x, number of $5 coins = y
x/2=y+60
x+5y=470
solving, get
x=220,y=50

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