5 7( )( )( )( )( )17
5 7( )( )( )( )( )17
5 7 ( )( )( )( )( )
①-6+3+(-7)-(-7) ②23-17-(-7)+(-16) ③-23+(+58)-(-5)
找规律;7/10,6/5,17/10,( ),( ).
找规律3,5,7,17,(),(),99
5/17*(-3/7)+5/17*(-4/7)-12/17 (-0.75)*(-3又1/8)-0.75*(-4又7/8)
( )( )( )乘以7=( )17
(51-17/3)*3/17简便方法,7/17*5/28+7/17*23/28
简算 (2+3+1/5)+(2/3-5/17)-(1/5+12/7)
计算:-16+23+(-17)-(-7)
23-17-(-7)+(-16)
-17+23+|(-16)-(-7)|