有理数(-0.125)12*813怎么算?

问题描述:

有理数(-0.125)12*813怎么算?

(-0.125)12*813
=-12*(816-3)/8
=-12*816/8+36/8
=-12*102+9/2
=-12(100+2)+9/2
=-1200-24+4.5
=-1219.5