五点二减一又五分之三除以零点375乘五分之四加八分之一乘零点八

Question

如题所述

Answer 1

解:5.2-1又3/5÷0.375*4/5+1/8*0.8

=26/5-8/5÷3/8*4/5+1/8*4/5

=26/5-8/5*8/3*4/5+1/10

=26/5-256/75+1/10

=(390-256)/75+1/10

=134/75+1/10

=(268+15)150

=283/150

追问

(0.375乘五分之四+八分一乘0.8)

追答

先算括号内
(0.375乘五分之四+八分一乘0.8)

=3/8*4/5+1/8*4/5
=3/10+1/10
=4/10
=2/5
原式=5.2-8/5÷2/5
=5.2-8/5*5/2
=5.2-4
=1.2

追问

能不能弄在一起

追答

解: 5.2-1又3/5÷(0.375*4/5+1/8*0.8)

=5.2-8/5÷( 3/8*4/5+1/8* 4/5)

=5.2-8/5÷( 3/10+1/10)

=5.2-8/5÷4/10

=5.2-8/5*5/2

=5.2-4

=1.2