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=5 50/70+7/70=5 57/70
b) 1/5-1/100*10/2=1/5-1/20=4/20-1/20=3/20
c)1 5/100*2/3-0,46=1 1/20*2/3-0,46=21/20*2/3-0,46=7/10-0,46=0,7-0,46=0,24
d) (72-18)*2=54*2=108
e) (-5)*(6*5/6)=(-5)*5=-25
f) (3/5)² :(2/5)² - (3/2)² =9/25: 4/25 - 9/4= 9/25*25/4-9/4=9/4-9/4=0
g)(-4)² - (-3)² = 16 -9= 7
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