Question

这两题能简便计算吗,能的话,怎样简便?1.02÷(5+0.4×0.25) 【6.85-（0.65+0.7）】÷2.5

Answer 1

1.02/（5+0.4*0.25）【6.85-（0.65+0.7）】/2.5

=1.02/（5+0.1）(6.85-1.35)/2.5

=1.02/5.1*5.5/2.5

=0.2*5.5/2.5

=1.1/2.5

=0.44