计算:-2+(1-0.2*3/5)/(-2)

问题描述:

计算:-2+(1-0.2*3/5)/(-2)
要明白额

=-2+(1-0.6/5)/(-2)
=-2+(1-0.12)/(-2)
=-2+0.88/(-2)
=-2-0.44
=-2.44那里不是乘以3,而是乘五分之三乘0.2*3/5,就是0.2先乘以3再除以5,和0.2乘以3/5,即0.2乘以0.6,是一样的啊