简便计算.1997/1998*998 51又三分之2÷3分之5+71又4分之3÷4分之7
问题描述：
简便计算.1997/1998*998 51又三分之2÷3分之5+71又4分之3÷4分之7
答
简便计算：
1997/1998*998
=1997*998/1998
=(1998-1)*998/1998
=998-998/1998
=997又500/999
51又三分之2÷3分之5+71又4分之3÷4分之7
=(51+2/3)*3/5+(71+3/4)*4/7
=153/5+2/5+284/7+3/7
=155/5+287/7
=31+41
=72
答
1997/1998*998
=(1998-1)*998/1998
=998-998/1998
=997+1000/1998
=887+500/999
51又三分之2÷3分之5+71又4分之3÷4分之7
=(50+5/3)÷(5/3)+(70+7/4)÷(7/4)
=50÷5/3+5/3÷5/3+70÷7/4+7/4÷7/4
=30+1+40+1
=72
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