(0.5*7*0.45)除以(1.5*0.

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(0.5*7*0.45)除以(1.5*0.(0.5*7*0.45)除以(1.5*0.(0.5*7*0.45)除以(1.5*0.(0.5*7*0.45)除以(1.5*0.7*3)=(0.5*7*0.45

(0.5*7*0.45)除以(1.5*0.
(0.5*7*0.45)除以(1.5*0.

(0.5*7*0.45)除以(1.5*0.
(0.5*7*0.45)除以(1.5*0.7*3)
=(0.5*7*0.45)除以(7*4.5)
=0.5