a) [tex]75+3{,}5=78{,}5\\18+3{,}5=21{,}5\\0+3{,}5=3{,}5\\-1+3{,}5=2{,}5\\-8+3{,}5=-4{,}5\\-10+3{,}5=-6{,5}[/tex]
b) [tex]1\frac{1\cdot50}{2\cdot50}=1\frac{50}{100}=1{,}5\\\\\\5-1{,}5=3{,}5\\1{,}5-1{,}5=0\\0-1{,}5=-1{,}5\\-2-1{,}5=-3{,}5\\-5-1{,}5=-6{,}5[/tex]
