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Practice the answers to the first volume of fifth grade mathematics synchronously.
Hello, landlord:

Known dividend+divisor+quotient+remainder =599

So according to the definition of division,

599 = dividend+divisor+quotient+remainder

= (quotient * divisor+remainder)+divisor+quotient+remainder

= (quotient+1) * divisor+remainder * 2+ quotient

Therefore, divisor =(599- quotient-remainder *2)/ (quotient+1)

=(599- 15- 12*2)/( 15+ 1)

= 35 Hope to adopt