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= 10 + 3
=13
7,4-(2,4:3/4 +3/8 :1,5)=
= 7,4 - (24/10*4/3 + 3/8 :3/2)
= 7,4 - (12/5*4/3 + 3/8 * 2/3)
= 7,4 - ((12*4)/(5*3) + (3*2)/(8*3))
= 7,4 - (16/5 + 1/4)
= 7,4 - (3,2+0,25)
= 7,4 - 3,45
= 3,95
-3 3/4 :3/4 + 5/6 *(-1 1/2) *(-2)
= -15/4 * 4/3 + 5/6 * 3/2* 2
= -5 + 15/6
= -5 +2 3/6
= -5 + 2,5
= - 2,5