(1/2-5/9+7/12)*(-36)

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(1/2-5/9+7/12)*(-36)(1/2-5/9+7/12)*(-36)(1/2-5/9+7/12)*(-36)(1/2-5/9+7/12)*(-36)=(54/108-60/108+63/1

(1/2-5/9+7/12)*(-36)
(1/2-5/9+7/12)*(-36)

(1/2-5/9+7/12)*(-36)
(1/2-5/9+7/12)*(-36)
=(54/108-60/108+63/108)*(-36)
=(57/108)*(-36)
=-57/3
=-19

(1/2-5/9+7/12)*(-36)
=-18+10-21
=10-39
=-29

原式=-18+20-21=-19

(18/36 - 20/36 +21/ 36 )(-36)
=19/36*(-36)
=-19

(1/2-5/9+7/12)*(-36)
=-18+20-21
-19