-(1 1/2)+4 1/2-19 1/2+13 1/2-(-2 1/2)=
1 1/4-(-7 2/5)+(-5 3/20)+4 1/2=
opuścić nawiasy i obliczyć.
-3/2 +9/2 -39/2 +27/2 +5/2 = 6/2-39/2 +32/2 = -1/2
1 1/4 + 7 2/5 -5 3/20 +4 1/2 = 7 + (1/4 +2/5- 3/20 +1/2)= 7 +( 5/20+8/20-3/20+10/20)=
7 + 20/20= 8'
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-3/2 +9/2 -39/2 +27/2 +5/2 = 6/2-39/2 +32/2 = -1/2
1 1/4 + 7 2/5 -5 3/20 +4 1/2 = 7 + (1/4 +2/5- 3/20 +1/2)= 7 +( 5/20+8/20-3/20+10/20)=
7 + 20/20= 8'