1/4乘0.8+1/2除以5/4+0.8怎么简算

问题描述:

1/4乘0.8+1/2除以5/4+0.8怎么简算

1/4乘0.8+1/2除以5/4+0.8=1/4x0.8+1/2x0.8+0.8=(1/4+1/2+1)x0.8=7/4x0.8=1.4

1/2*4+1?4*6+1/6*8+.+1/2010*2012
=2[(1/2-1/4)+ (1/4-1/6)+(1/6-1/8).+(1/2010-1/2012)
=1-1/1006
=1005/1006