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b)12000 +6 2/5 · 5 5/8 = 12000+32/5*45/8=12000+6,4*5,625=12000+36=12036
c)(500,15 + 9 ) : 0,01 =509,15:0,01=50915
d) 330 + 1 3/5 · 60 =330+8/5*60=330+1,6*60=330+96=426
e) 10 · (100,5 - 16,1 : 1/5 =10*(100,5-16,1:0,2)=10*(100,5-80,5)=10*20=200
f)3,6 · 60 - 1.3 · 20 =216-1,3*20=216-26=290
g) 3 3/4 : 15 · 1000 =15/4:15*1000=3,75:15*1000=0,25*1000=250
h)1000 - 4/5 : 0,8 =1000-0,8:0,8=1000-1=999
i)37,1 : ( 4 - 3,9) =37,1:0,1=371
( 7 - 4 4/5 ) · ( 17 3/5 + 12,4) =(7-24/5)*(17 3/5+12,4)=(7-4,8)*(17 3/5+12,4)=2,2*(88/5+12,4)=2,2*(17,6+12,4)=2,2*30=66
k) 0,232 : 0,4 · 100 = 323/400*100=80,75