第1题的题目中(-23/3/4)有两种理解,
一是(-23)/(3/4),另一是(-23/3)/4,分别运算如下:
49.7-[-23/3/4+(18.7-25.25)]
=49.7-(18.7-25.25-23*4/3)
=(49.7-18.7)+(25.25+23*4/3)
=31+(25+1/4)+(30+2/3)
=(31+25+30)+(1/4+2/3)
=86+11/12
49.7-[(-23/3)/4+(18.7-25.25)]
=49.7+(23/3)/4-18.7+25.25
=(49.7-18.7)+(25.25+23/3*4)
=31+(25+3/12+23/12)
=56+26/12
=58+1/6
2.
12+1又3/4-8又5/12-6.75
=12+1+3/4-8-5/12-6-3/4
=(12+1-8-6)+(3/4-5/12-3/4)
=-1-5/12
=-(1+5/12) 或=-17/12
3.
-(-3)^2-(1又1/2）*2/9-6/|-1/3|^3
=-9-(3/2)*2/9-6*27
=-9-1/3-162
=-(171+1/3) (即-171又1/3)
4.
-2^5/(-4)*(1/2)^2-1/12*(-5*2^3)^2
=2-1/12*40^2
=2-(20^2)/3
=2-133-1/3
=-(131+1/3)
5.
1又2/3-5又3/4-2^3/[(1/2)^2+3*(-3/4)]*1/8
=(1+2/3)-(5+3/4)-8/[1/4-9/4)]*1/8
=(1+2/3)-(5+3/4)-8/(-2)*1/8
=(1-5)+(2/3-3/4)+1/2
=-4+(8-9+6)/12
=-4+5/12
6.
(-0.1)^3-1/4*(-3/5)^2
=-0.001-9/(25*4)
=-0.001-0.09
+-0.0091
已经给做了一半多了,剩下的你自己做吧,不要自己不动脑筋让别人代劳,这样对你自己没好处.