1.-7-4-3.5-2.5=
问题描述：
1.-7-4-3.5-2.5=
2.3.7+(-2.7)-(-1.3)-3.6
3.三分之一+（-二分之一）+四分之三-（-三分之二）
4.-0.8-（-0.8）-（-五分之四）-0.92-（-9）
5.-17+（-18）+（-6）-2-16.5
6.丨5又四分之三丨-丨-2+3+0.75丨=
7.丨-4又四分之一丨-（-5又四分之三）+（-4七分之三）
8.-丨-0.125丨+四分之三-（0.125）+丨-0.75丨=
答
=-7-4-(3.5+2.5)
=-7-4-7
=-18
=3.7-2.7+1.3-3.6
=1+1.3-3.6
=-1.3
=1/3+2/3+(-2/4)+3/4
=1+1/4
=5/4
=-0.8+0.8+0.8-0.92+9
=0.8-0.92+9
=8.88
=-17-18-6-2-16.5
=-59.5
=5.75-1.75
=4
=17/4+23/4-31/7
=10-31/7
=70/7-31/7
=39/7
=-0.125-0.125+0.75+0.75
=-0.25+1.5
=1.25
我可素很辛苦的!