这数学怎么做啊
1)Yourdeposited$450intoherbankaccount.Thenewbalanceis$512.Whatwastheoriginalbalance?2...
1)Your deposited $450 into her bank account. The new balance is $512. What was the original balance?
2）Between 7：30 A.M. and 8：00 A.M. the number of students in a school increased by 73. There were 152 students in the school at 8:00 A.M. How many students were in school at 7:30 A.M.?
别直接写答案。。。。
$512-$450=$62你这个450怎么来的，要写出来。。。 展开
2）Between 7：30 A.M. and 8：00 A.M. the number of students in a school increased by 73. There were 152 students in the school at 8:00 A.M. How many students were in school at 7:30 A.M.?
别直接写答案。。。。
$512-$450=$62你这个450怎么来的，要写出来。。。 展开
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1.你在她的银行账户存了512美元。新的余额是512美元，原先的余额是多少？ $512-$450=$62
2.早上7点到8点之间某学校学生人数增加了73人。8点时学生人数是152人。7点时有多少人？152-73=79
2.早上7点到8点之间某学校学生人数增加了73人。8点时学生人数是152人。7点时有多少人？152-73=79
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