数学计算题!!!!!!!(有高分)

显示全部楼层 · 2007-6-29 09:16:51

1.-15 2.-1/4 3.8

千问 · 2007-6-29 09:16:51

1)(-20)+(+3)-(+5)-(-7)=-20+3-5+7=-15(2)1/3-1/2-3/4+2/3=4/12 - 6/12 - 9/12 +8/12=-3/12=-1/4(3)(1+9)-(1+10)+(-2)-(-8)+3=10-1-10-2+8=5

千问 · 2007-6-29 09:16:51

(1)(-20)+(+3)-(+5)-(-7) =-15(2)1/3-1/2-3/4+2/3 =-1/4(3)(1+9)-(1+10)+(-2)-(-8)+3=8

千问 · 2007-6-29 09:16:51

(1)(-20)+(+3)-(+5)-(-7) =-20+3-5+7 =-15(2)1/3-1/2-3/4+2/3 =4/12-6/12-9/12+8/12 =-1/4(3)(1+9)-(1+10)+(-2)-(-8)+3 =1+9-1-10-2+8+3 =10-13+11 =8嘻,你好可爱

千问 · 2007-6-29 09:16:51

1.-15 2.-1/4 3.81.-152.-1/43.8

千问 · 2007-6-29 09:16:51

(1)(-20)+(+3)-(+5)-(-7) =-15(2)1/3-1/2-3/4+2/3 =-1/4(3)(1+9)-(1+10)+(-2)-(-8)+3=8

千问 · 2007-6-29 09:16:51

1)-20+3-5+7=-152)=1/2-3/4=-1/43)-1-2+8+3=8

千问 · 2007-6-29 09:16:51

1. 原式＝3-20-5+7＝-152. 原式＝1-5/4＝-1/43.原式＝10-11-2+8+3＝9