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your local bank offers free checking for accounts with a bal

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your local bank offers free checking for accounts with a balance of at least $500.suppose you have a balance of $516.46 and you write a check for $31.96.how much must you deposit to avoid being charge a service free
your local bank offers free checking for accounts with a bal
=500-(516.46-31.96)=15.5
至少要存15.5美金
再问: 那这一题呢?? find real numbers x, y, z, and w for which it is true that x>y and z>w, but it is not true that x-z>y-w
再答: 这个随便找几个数就好了 x=100 y=80 z=20 w=10