0.7*13/9+11/4*(-15)+0.7*5/9+1/4*(-15)

问题描述:

0.7*13/9+11/4*(-15)+0.7*5/9+1/4*(-15)

0.7*13/9+11/4*(-15)+0.7*5/9+1/4*(-15)
=0.7*13/9+0.7*5/9+11/4*(-15)+1/4*(-15)
=0.7*(13/9+5/9)+(11/4+1/4)*(-15)
=0.7*2+(-15)*3
=1.4-45
=-43.6