P.6-F.1 Mathematics [超急!!!]

2012-07-29 5:59 pm

2)
5(2k-7)=23-(3+k) k=?

3)
3y/8 - y/2=0 y=?

6)
Mary has 100 $1 and $0.5 coins.There is altogether $64. Find the number of $1 and $0.5 coins. (列式)

回答 (2)

2012-07-29 11:21 pm

✔ 最佳答案

2) 10k-35=23-3-k
10k+k=20+35
11k=55
k=5

3) y=0

6) Let Mary have x $1, then she has 100-x $0.5
x+0.5(100-x)=64
x+50-0.5x=64
0.5x=14
x=28

參考: me

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2012-07-29 6:06 pm

2) 10k-35=23-3-k
11k=55
k=5

3) -y/8 = 0
y = 0

6) set Mary has x $1, then she has 100-x $0.5
x+0.5(100-x)=64
x+50-0.5x=64
0.5x=14
x=28

參考: 自己

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