-13x3/2+3/1x(-13)-0.34x7/2-7/5x0.34用简便方法计算

问题描述:

-13x3/2+3/1x(-13)-0.34x7/2-7/5x0.34用简便方法计算

原式=-13×(2/3+1/3)-0.34×(5/7+2/7)
=-13-0.34
=-13.34