(1/9-3/85)×18×51=?

(1/9-3/85)×18×51=?

(1/9-3/85)×18×51
=2*51-9*18/5
=102-32.4
=69.6

(1/9-3/85)×18×51=69.6

原式=(1/9×18-54/85)×51
=(2-54/85)×51
=102-2754/85
=8670/85-2754/85
=5916/85
=69.6