北师大版 (-64)+17+(-23)+68 (-52)+241+(-74)+2 41+(-23)+(-31)+0(-26)+52+16+(-72)这几道题不明白,
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![北师大版 (-64)+17+(-23)+68 (-52)+241+(-74)+2 41+(-23)+(-31)+0(-26)+52+16+(-72)这几道题不明白,](/uploads/image/z/473227-43-7.jpg?t=%E5%8C%97%E5%B8%88%E5%A4%A7%E7%89%88+%28-64%29%2B17%2B%28-23%29%2B68+%EF%BC%88-52%EF%BC%89%2B241%2B%EF%BC%88-74%EF%BC%89%2B2+41%2B%EF%BC%88-23%EF%BC%89%2B%EF%BC%88-31%EF%BC%89%2B0%EF%BC%88-26%EF%BC%89%2B52%2B16%2B%EF%BC%88-72%EF%BC%89%E8%BF%99%E5%87%A0%E9%81%93%E9%A2%98%E4%B8%8D%E6%98%8E%E7%99%BD%2C)
北师大版 (-64)+17+(-23)+68 (-52)+241+(-74)+2 41+(-23)+(-31)+0(-26)+52+16+(-72)这几道题不明白,
北师大版
(-64)+17+(-23)+68 (-52)+241+(-74)+2 41+(-23)+(-31)+0
(-26)+52+16+(-72)这几道题不明白,
北师大版 (-64)+17+(-23)+68 (-52)+241+(-74)+2 41+(-23)+(-31)+0(-26)+52+16+(-72)这几道题不明白,
(-64)+17+(-23)+68
=-64+17-23+68
=-47-23+68
=-70+68
=-2
(-52)+241+(-74)+2
=-52+241-74+2
=189-74+2
=115+2
=117
41+(-23)+(-31)+0
=41-23-31+0
=18-31+0
=-13
(-26)+52+16+(-72)
=-26+52+16-72
=26+16-72
=42-72
=-30