80×61-67.2÷32怎么算
1个回答

80×61-67.2÷32

=4880-2.1

=4877.9

[9-(5+1/4)]÷[4+1/3-(1+3/4)]

=[9-5-1/4)]÷[4+1/3-1-3/4]

=[4-1/4]÷[3+1/3-3/4]

=(11/4)÷[3-5/12]

=(11/4)÷(31/12)

=11/4*12/31

=11*3/31

=33/31

=1+2/31

=1又2/31

54237-408×28÷24

=54237-17×28

=54237-476

=53761

(1+1/5)[5*(6+3/5)÷1.8-(3+1/4)]

=(6/5)[5*33/5÷9/5-13/4]

=(6/5)[5*33/5*5/9-13/4]

=(6/5)[55/3-13/4]

=(6/5)(181/12)

=6/5*181/12

=181/10

=18+1/10

=18又1/10