Răspuns:
7. a) 2/7*(3/5*105)=2/7*315/5
=630/35=18
b)15/100*(75/100*1600)=15/100*1200=18000/100
=180
c)3/5*(30/100*500)=3/5*150=450/5=90
d)29/100*(5/7*350)=29/100*1750/7
=72,5
8. a). 30/100*60+25/100*50
=1800/100+1250/100
=18+12,5=30,5
b) 2/9*180+4/7*280
=360/9+160
=40+160=200
c) 15/100*120+1/37*185
1800/100+185/37
18+5=23
Explicație pas cu pas:
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