数学谢谢!!1!!!!!!!!!!!!!!!!!
(+ )-(4 )+(4 )+(-6 )
= - + -
=( + )-( + )
=5-11
=-6
-32 +5 -3 -5 -12
=-32 +(5 -5 )-(3 +12 )
=-32 +0-( + )
=-32 +0-16
=-48
-0。 5-3 +2。75-7
=-0。5-3。25+2。75-7。5
=-8。5
3 -(-2 )+(- )+2。75-7
=
。
(+ )-(4 )+(4 )+(-6 )
= - + -
=( + )-( + )
=5-11
=-6
-32 +5 -3 -5 -12
=-32 +(5 -5 )-(3 +12 )
=-32 +0-( + )
=-32 +0-16
=-48
-0。
5-3 +2。75-7
=-0。5-3。25+2。75-7。5
=-8。5
3 -(-2 )+(- )+2。75-7
=
。收起