1. 27+2.2+1.42-0.8-(2.52+1.3)×1000
(1)2.2+1.42-0.8=2.82元.
答:星期三收盘时,该股票涨了2.82元.
(2)27+2.2+1.42=30.62元.
27+2.2+1.42-0.8-2.52=27.30元.
答:本周内该股票的最高价是每股30.62元;最低价是每股27.30元.
(3)27+2.2+1.42-0.8-2.52+1.3=28.6元,
28.6×1000×(1-1.5‰-1‰)-27×1000×(1+1.5‰)=28528.5-27040.5=1488元.
答:小杨在星期五收盘前将全部股票卖出,则他将赚1488元.
2. 2.78-0.46+2.22-0.54
2.78-0.46+2.22-0.54
=2.78+2.22-(0.46+0.54)
=5-1
=4
3. 2.56/0.04/0.5 1.92*0.12-2.7
图
4. 2.01+2.02+2.03+2.04+……+2.49+2.5
首末向中间以两个数一组,共分25个数值相等的组
=2.01+2.50+2.02+2.49+.......+2.25+2.56
=4.51*25
=112.75
5. 1.8*41+2.2*25%=?
1.8*41+2.2*0.25=73.8+0.55=74.35
6. 2.8*4+7.2/0.25
如图:2.8*4+7.2/0.25=40
7. 2.73×69+69×9.9+27.3×3.1
2.73×69+69×9.9+27.3×3.1
=2.73x69+2.73x31+69x(10-0.1)
=2.73x(69+31)+69x10-69x0.1
=2.73x100+690-6.9
=273+690-6.9
=963-6.9
=956.1
8. 27.5×1.4+0.96×275-2.75×10
=275×(0.14+0.96-0.1)
=275×1
=275