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1.Calculeaza:
a) 174/20-6,9
b)25/63 : 5/7+9/5
c)3,12-1,75+2,06
d)0,625×1,32:0,25
e)1,5+3,(4)-2,1(6)
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Răspuns:

a) 174/20-6.9=8.7-6.9=1.8

b) 25/63:5/7+9/5=25/63*7/5+9/5=5/9+9/5=25/45+81/45=106/45

c) 3.12-1.75+2.06=1.37+2.06=3.43

d) 0.625*1.32:0.25=2.5*1.32=3.3

e) 1.5+3.(4)-2.1(6)=15/10+31/9-195/90=135/90+310/90-195/90=250/90=25/9

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