初中有理数加减混合运算
问题描述:
初中有理数加减混合运算
1.计算:
(1)-2.5+(-1/5) (2) 0.4-(-1/4)+1/6
(3)1/3-(-5/6)+2/3 (4) 1/3+(-1/5)+1+2/3
(5)27-18+(-7)-32 (6)0.5+(-1/4)-(-2.75)+1/2
2.计算:
(1)33.1-(-22.9)+(-10.5) (2)(-8)-(-15)+(-9)-(-12)
(3)-2/3+(-1/6)-(-1/4)-1/2 (4)3/5-3/2+(-11/4)+13/4
虽然讲过了,可系我系不懂,请帮帮忙啦.要过程谢谢
答
=(-25/10)+(-2/10) =-(25/10+2/10) =-27/10 =4/10+1/4+1/6 =24/60+15/60+10/60 =49/60 =2/6+5/6+4/6 =11/6=1/3-1/5+1+2/3 =5/15-3/15+1+2/3+10/15 =9/5 =27-18-7-32=27-7-(18+32)=20-50=-30=2/4-1/4+11/4+2/4=1/4+11...