问题 填空题 把下面的算式补充完整。(1)18.7-16.4+( ) =18.7+( )-16.4 =20-16.4 =( )(2)35.67+( )+21.35 =35.67+( +21.35) =35.67+50 =( )(3)54.37-( )-9.23 =54.37-( +9.23) =54.37-10 =( )(4)33.25+6.23-( ) =33.25-( )+6.23 =30+6.23 =( ) 答案 (1)1.3;1.3;3.6;(2)28.65;28.65;85.67;(3)0.77;0.77;44.37;(4)3.25;3.25;36.23