-785×-1/4加25%×10又1/2加0.25×负4.5=?快-785×-1/4加25%×10又1/2加0.25×负4.5=200

问题描述:

-785×-1/4加25%×10又1/2加0.25×负4.5=?快
-785×-1/4加25%×10又1/2加0.25×负4.5=200

=785*0.25+0.25*10.5+0.25*-4.5
=(785+10.5-4.5)*0.25
=790*0.25=197.5