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b) (- 3/8) : (- 5/12)=(-3/8)*(-12/5)=9/10
c)22/5 ×(- 3 1/(6 ))=22/5*19/6=209/15=13 i14/15
d(21/3 - 2,5 × 2)× 2 1/4= (21/3 -5)*2¼=(7-5)*2¼=2*2¼=4½
e(- 8) ×(-5/12)+ 3 1/3 : ( - 2 2/9)=3⅓+10/3*(-9/22)=3⅓+1½=4 i 5/6