[17/4一(2/7 13/42)]÷13/4简便运算怎么算?
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[17/4一(2/7 13/42)]÷13/4
=[17/4一(2/(307/42))]×4/13
=17/4×4/13一(2/(307/42))×4/13
=17/13-84/307×4/13
=(17-336/307)/13
=(4883/307)/13
=4883/3991
=1又892/3991
=[17/4一(2/(307/42))]×4/13
=17/4×4/13一(2/(307/42))×4/13
=17/13-84/307×4/13
=(17-336/307)/13
=(4883/307)/13
=4883/3991
=1又892/3991
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