简算:0.25×8÷20-0.785÷78.55

问题描述:

简算:0.25×8÷20-0.785÷78.55

0.09.........

0.25×8÷20-0.785÷78.55
=0.25×(2×4)÷20-0.785÷78.55
=0.25×4×2÷20-0.785÷78.55
=2÷20-0.785÷78.55
=0.1-0.009
=0.091